As a Line Producer, AD or UPM I am often tasked with the question of whether or not the film will be scheduled using a 5 Day week or a 6 Day week time frame.

In general I prefer a 5-Day week but sometimes a 6-Day week will have its advantages if the budget is really tight.

5 Day Week
Don’t have to worry about 6th day time and half pay
-Gives cast and crew adequate time to rest and recharge
-Allows Directors, ADs or Producers enough time to make critical adjustments to the following week
-Allows for enough turnaround time for actors when you are shooting splits or nights toward the end of the week

6 Day Week
Great option if you are doing a rather small shoot that lasts one or two weeks. So if you do two 6-day weeks you get 12 shoot days instead of shooting three five-day weeks. This cuts down on vendor rentals etc.
-If doing for an extended period time (more than 2 weeks) this can potentially lead to sickness within the cast/crew and fatigue

Third Option
In some cases you may want to have a hybrid of sorts. Its possible that you might decide to shoot five day weeks and then switch over to a six day week or vice versa.