We're looking at hiring a systems administrator contractor at a certain hourly rate to do sysadmin-y things. So far, this is easy enough for me to wrap my brain around.
But during certain hours, we'd like this individual to be "on call" or on standby. He won't be "working", but the expectation is that he will never be more than 15 minutes away from an SSH prompt during those times.
Should he need to spring into action, his normal hourly rate applies of course, but what about when he is on call?
Is it customary to pay a contractor a reduced rate to be on standby, or do hourly sysadmin contractors normally expect a certain amount of 'on call' time as part of the job?
The company and contractor are both located in the US.