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Please refer to following steps in Power Automate to calculate hours between Start Time and End Time:
Start Compose:
ticks(triggerBody()?['EventDate'])
End Compose:
ticks(triggerBody()?['EndDate'])
DifferenceAshours Compose:
div(div(mul(sub(outputs('End'),outputs('Start')),100),1000000000),3600)
Result:
Then you could use DifferenceAshours Compose to update columns in calendar list.
More information:
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