Right on Elbee -- the STOP is more important than the START -- hehehe
If she is normal, she will stand for most of the day on into evening -- then you will still be ok for at least 6 hours after the end.
Personally, I might be trying to find another ARM just in case she needs it by midnight -- the fact that it is "Whenever I get there" is not good enough for this business -- there are times when timing is everything -- absolutely everything!
Watch her close for when she stops -- and good luck!
Terry