Hello @bsteinacher,
Thank You for posting your query onto the Forum.
Well you can simply use the “DATEDIFF” function to calculate the Time Scheduled. Below is the screenshot provided for the reference -
I’m also attaching the Excel as well as PBIX file of my working for the reference.
Hoping you find this useful and helps you in your analysis. 
Thanks and Warm Regards,
Harsh
Time Scheduled.xlsx (9.0 KB)
Time Scheduled.pbix (42.0 KB)