We have been designing a solution for shift work, however, in the meantime, we have a workaround you could try. The example below is for a shift/roster that repeats every 5 weeks on a Wednesday, Thursday & Friday:
Tap ‘+’ to create an event
Name the first shift block (e.g. Shift 1)
Add the start time and end time
Tap ‘Repeat’ and select ‘Custom’
Select Frequency ‘Weekly’
Select Every ‘5’ weeks
Select ‘Wednesday, Thursday, Friday’
Tap ‘Done’ (top right)
Tap ‘Add’ (top right)
You can use our 'Tag' feature to color code your shifts to make them more visible in the calendar.