When using FAST Forward, how important is it for the treatment to be delivered Monday through Friday in one week as opposed to spanning a weekend?

Presumably unimportant.

From the protocol:

"13. TREATMENT SCHEDULING AND GAPS
Treatment can start on any day of the week.
A gap of up to 3 days is acceptable in the event of machine service or breakdown. This is preferable to transferring the patient to a machine on which daily verification imaging is...