will the MCAS input another 10 seconds worth of trim after a 5 second pause?
If allowed to finish, and with the high AOA still persistent, is MCAS done or will start again?
Yes. See
737 MAX - MCAS
"The MCAS design at the time of these accidents would trim the
Stabilizer down for up to 9.26 seconds (2.5 deg nose down) then pause for 5 seconds and repeat if the conditions (high AoA, flaps up and autopilot disengaged) continued to be met. If the pilots used electric pitch trim, it would only pause MCAS for 5s; to deactivate it you have to switch off the STAB TRIM CUTOUT switches."