my 2cents not having been in the military, but having some experience with other things.
I would go with the idea of:
if in garrison a full maintenance cycle is done monthly, with basic maintenance done weekly.
during combat operations a Full maintenance cycle is done weekly, and a minimum of a basic maintenance cycle needs to be done after every operation.
a basic maintenance cycle takes approximately 30 min + (insert weight modified time formula)
a full maintenance cycle takes approximately 8 hours + (insert weight modified time formula)
the basic maintenance cycle is mostly running and checking an automated test cycle, checking for red flags, and checking simple things, (compare it to a modern car where you turn it on and it runs the instrument cluster (P.O.S.T {Power On Self Test} )or equivalent, plus checking basics like tire pressure, and fluid levels)
Full Maintenance cycles are a much more involved checklist and diagnostic cycle, essentially like plugging in a ODB2 or diagnostic test rig and checking everything plus things like checking wear components (break pads, filters, etc. )
the salvage /repair order is likely like doing a full maintenance cycle to recover units IMO 1 unit per team dispatched.
in regards to the m4 sherman vs m1 abrams the m4 sherman may require effectively more maintenance per system, but the M1 Abrams has so many more and so much more complicated systems that it really needs a lot more maintenance