In my opinion you should give them a specific protocol and not be ambiguous about it.
Me personally, I would have them set the time in military time.
/dj 02:00 means be done at 2 am.
If they wanted it for 2 hours use: dj 2
2.5 hours: /dj 2.5
This way if there is a : in it, you know its a specific time. Otherwise it's an amount of time.
