Does anyone require a minimum number of hours/days/shifts of availability for their part-time staff to retain employment? For example, if after a year of working X,Y, and Z shifts, they can now only work Z... do you part ways or keep them on for just Z shifts?
We require at least 16 hours of availability, including one weekend day. Depending on the event calendar, they may be scheduled below the 16 hour availability but we at least have a useful availability. Our staff is welcome to ask for time off here and there that may be under our requirements, but their general availability still meets our needs.
If they ever have to change their availability where it is below our guidelines, we are open for conversation. Say for that semester or for a month or two they have obligations to meet, we're ok making an exception for that time period with the understanding that they will open their availability to the minimum once it's done. If they really can't meet that, we are then we start discussions about parting ways.