diff --git a/src/bonsai/bonsai/bim/__init__.py b/src/bonsai/bonsai/bim/__init__.py
index 7ff9858430..cc030819c0 100644
--- a/src/bonsai/bonsai/bim/__init__.py
+++ b/src/bonsai/bonsai/bim/__init__.py
@@ -131,6 +131,7 @@ classes = [
     prop.ObjProperty,
     prop.MultipleFileSelect,
     prop.Attribute,
+    prop.ISODuration,
     prop.BIMAreaProperties,
     prop.BIMTabProperties,
     prop.BIMProperties,
diff --git a/src/bonsai/bonsai/bim/module/resource/__init__.py b/src/bonsai/bonsai/bim/module/resource/__init__.py
index 33b507e0a8..ae08660afd 100644
--- a/src/bonsai/bonsai/bim/module/resource/__init__.py
+++ b/src/bonsai/bonsai/bim/module/resource/__init__.py
@@ -59,7 +59,6 @@ classes = (
     prop.Resource,
     prop.BIMResourceProperties,
     prop.BIMResourceTreeProperties,
-    prop.ISODuration,
     prop.BIMResourceProductivity,
     ui.BIM_PT_resources,
     ui.BIM_UL_resources,
diff --git a/src/bonsai/bonsai/bim/module/resource/prop.py b/src/bonsai/bonsai/bim/module/resource/prop.py
index 8b258cc752..350417aa69 100644
--- a/src/bonsai/bonsai/bim/module/resource/prop.py
+++ b/src/bonsai/bonsai/bim/module/resource/prop.py
@@ -24,7 +24,7 @@ import bonsai.tool as tool
 import bonsai.bim.module.pset.data
 import bonsai.bim.module.resource.data
 import bonsai.bim.module.sequence.data
-from bonsai.bim.prop import Attribute
+from bonsai.bim.prop import Attribute, ISODuration
 from bpy.types import PropertyGroup
 from bpy.props import (
     PointerProperty,
@@ -95,25 +95,6 @@ def updateResourceUsage(self: "Resource", context: object) -> None:
     bonsai.bim.module.pset.data.refresh()
 
 
-class ISODuration(PropertyGroup):
-    name: StringProperty(name="Name")
-    years: IntProperty(name="Years", default=0)
-    months: IntProperty(name="Months", default=0)
-    days: IntProperty(name="Days", default=0)
-    hours: IntProperty(name="Hours", default=0)
-    minutes: IntProperty(name="Minutes", default=0)
-    seconds: IntProperty(name="Seconds", default=0)
-
-    if TYPE_CHECKING:
-        name: str
-        years: int
-        months: int
-        days: int
-        hours: int
-        minutes: int
-        seconds: int
-
-
 class Resource(PropertyGroup):
     name: StringProperty(name="Name", update=updateResourceName)
     ifc_definition_id: IntProperty(name="IFC Definition ID")
diff --git a/src/bonsai/bonsai/bim/module/resource/ui.py b/src/bonsai/bonsai/bim/module/resource/ui.py
index 4476c01293..b061600978 100644
--- a/src/bonsai/bonsai/bim/module/resource/ui.py
+++ b/src/bonsai/bonsai/bim/module/resource/ui.py
@@ -25,7 +25,8 @@ from bonsai.bim.module.resource.data import ResourceData
 from typing import Any, TYPE_CHECKING
 
 if TYPE_CHECKING:
-    from bonsai.bim.module.resource.prop import ISODuration, Resource, BIMResourceTreeProperties
+    from bonsai.bim.prop import ISODuration
+    from bonsai.bim.module.resource.prop import Resource, BIMResourceTreeProperties
 
 
 class BIM_PT_resources(Panel):
diff --git a/src/bonsai/bonsai/bim/module/sequence/__init__.py b/src/bonsai/bonsai/bim/module/sequence/__init__.py
index a2e911598d..13e23e1f2f 100644
--- a/src/bonsai/bonsai/bim/module/sequence/__init__.py
+++ b/src/bonsai/bonsai/bim/module/sequence/__init__.py
@@ -127,7 +127,6 @@ classes = (
     prop.Task,
     prop.TaskResource,
     prop.TaskProduct,
-    prop.ISODuration,
     prop.IFCStatus,
     prop.BIMStatusProperties,
     prop.BIMWorkScheduleProperties,
diff --git a/src/bonsai/bonsai/bim/module/sequence/helper.py b/src/bonsai/bonsai/bim/module/sequence/helper.py
index 983aeffee2..11cf7336b2 100644
--- a/src/bonsai/bonsai/bim/module/sequence/helper.py
+++ b/src/bonsai/bonsai/bim/module/sequence/helper.py
@@ -16,12 +16,17 @@
 # You should have received a copy of the GNU General Public License
 # along with Bonsai.  If not, see <http://www.gnu.org/licenses/>.
 
+from __future__ import annotations
+
 import isodate
+import bpy
 from dateutil import parser
 import ifcopenshell.util.date
 from datetime import timedelta, datetime
 from typing import Union
 
+from bonsai.bim.prop import ISODuration
+
 
 def parse_datetime(value):
     try:
@@ -65,13 +70,17 @@ def parse_duration_as_blender_props(dt, simplify=True):
         }
 
 
-def blender_props_to_iso_duration(durations_attributes, duration_type, prop_name):
+def blender_props_to_iso_duration(
+    durations_attributes: bpy.types.bpy_prop_collection_idprop[ISODuration],
+    duration_type: Union[str, None],
+    prop_name: str,
+) -> Union[str, None]:
     duration_props = None
     for collection in durations_attributes:
         if collection.name == prop_name:
             duration_props = collection
             break
-    if duration_props and not duration_type or duration_type == "ELAPSEDTIME":
+    if duration_props and (not duration_type or duration_type == "ELAPSEDTIME"):
         duration_string = "P{}Y{}M{}DT{}H{}M{}S".format(
             duration_props.years if duration_props.years else 0,
             duration_props.months if duration_props.months else 0,
diff --git a/src/bonsai/bonsai/bim/module/sequence/prop.py b/src/bonsai/bonsai/bim/module/sequence/prop.py
index 7c7f7c61d1..04ab0cde02 100644
--- a/src/bonsai/bonsai/bim/module/sequence/prop.py
+++ b/src/bonsai/bonsai/bim/module/sequence/prop.py
@@ -28,7 +28,7 @@ from bonsai.bim.module.sequence.data import SequenceData, AnimationColorSchemeDa
 import bonsai.bim.module.resource.data
 import bonsai.bim.module.pset.data
 from mathutils import Color
-from bonsai.bim.prop import StrProperty, Attribute
+from bonsai.bim.prop import Attribute, ISODuration
 from dateutil import parser
 from bpy.types import PropertyGroup
 from bpy.props import (
@@ -428,25 +428,6 @@ class BIMWorkPlanProperties(PropertyGroup):
         work_schedules: str
 
 
-class ISODuration(PropertyGroup):
-    name: StringProperty(name="Name")
-    years: IntProperty(name="Years", default=0)
-    months: IntProperty(name="Months", default=0)
-    days: IntProperty(name="Days", default=0)
-    hours: IntProperty(name="Hours", default=0)
-    minutes: IntProperty(name="Minutes", default=0)
-    seconds: IntProperty(name="Seconds", default=0)
-
-    if TYPE_CHECKING:
-        name: str
-        years: int
-        months: int
-        days: int
-        hours: int
-        minutes: int
-        seconds: int
-
-
 class IFCStatus(PropertyGroup):
     name: StringProperty(name="Name")
     is_visible: BoolProperty(
diff --git a/src/bonsai/bonsai/bim/prop.py b/src/bonsai/bonsai/bim/prop.py
index 7c0ea1518a..70adc430b7 100644
--- a/src/bonsai/bonsai/bim/prop.py
+++ b/src/bonsai/bonsai/bim/prop.py
@@ -444,6 +444,23 @@ class Attribute(PropertyGroup):
         setattr(self, self.get_value_name(), value)
 
 
+class ISODuration(PropertyGroup):
+    years: IntProperty(name="Years", default=0)
+    months: IntProperty(name="Months", default=0)
+    days: IntProperty(name="Days", default=0)
+    hours: IntProperty(name="Hours", default=0)
+    minutes: IntProperty(name="Minutes", default=0)
+    seconds: IntProperty(name="Seconds", default=0)
+
+    if TYPE_CHECKING:
+        years: int
+        months: int
+        days: int
+        hours: int
+        minutes: int
+        seconds: int
+
+
 def get_tab(
     self: "Union[BIMAreaProperties, BIMTabProperties]", context: bpy.types.Context
 ) -> list[tuple[str, str, str, str, int]]:
diff --git a/src/bonsai/bonsai/tool/sequence.py b/src/bonsai/bonsai/tool/sequence.py
index ceb5994228..7497bba0e4 100644
--- a/src/bonsai/bonsai/tool/sequence.py
+++ b/src/bonsai/bonsai/tool/sequence.py
@@ -43,7 +43,7 @@ from collections.abc import Iterable
 from mathutils import Color
 
 if TYPE_CHECKING:
-    import bonsai.bim.prop
+    from bonsai.bim.prop import Attribute
     from bonsai.bim.module.sequence.prop import (
         BIMAnimationProperties,
         BIMStatusProperties,
@@ -405,9 +405,7 @@ class Sequence(bonsai.core.tool.Sequence):
 
         props = cls.get_work_schedule_props()
 
-        def callback(
-            name: str, prop: Union[bonsai.bim.prop.Attribute, None], data: dict[str, Any]
-        ) -> Union[bool, None]:
+        def callback(name: str, prop: Union[Attribute, None], data: dict[str, Any]) -> Union[bool, None]:
             if prop and prop.data_type == "string":
                 # TODO: Check actual attribute type instead of providing attribute names.
                 if name in ("ScheduleDuration", "ActualDuration", "FreeFloat", "TotalFloat"):
@@ -451,7 +449,7 @@ class Sequence(bonsai.core.tool.Sequence):
 
         props = cls.get_work_schedule_props()
 
-        def callback(attributes, prop):
+        def callback(attributes: dict[str, Any], prop: Attribute) -> bool:
             if "Start" in prop.name or "Finish" in prop.name or prop.name == "StatusTime":
                 if prop.is_null:
                     attributes[prop.name] = None
@@ -473,6 +471,7 @@ class Sequence(bonsai.core.tool.Sequence):
                     for value in props.durations_attributes.values():
                         value = 0
                     return True
+            return False
 
         return bonsai.bim.helper.export_attributes(props.task_time_attributes, callback)