1. Never heard of people getting an AWOL charge for being a few
minutes late. Though I suppose that should be quite possible if
it's a repeat offence.
2. If you are a repeat offender, then, yes, you can expect
heavier punishments than mere extras and confinements. SOL, RP, and
DB are all possible.
3. From what I know your ORD can only be extended if you got
thrown into DB. For everything else, at most all your offs-in-lieu
and outstanding leave will be burnt. Though I could be wrong about
this.
In the first place, why are have you been repeatedly late for
booking in?