Show times start your duty day, not midnight and not block. So if I have a show time on 12/1 at 11:00 and my first flight begins at 11:45, then my duty day ends on 12/2 at 11:00. Also, you can not be scheduled for more than 8 hours of block flying in ANY 24 consecutive hour span, you can still end up flying more than the 8 hours as long as it is your original schedule and not revised after your show time. AND, as far as a duty day is concerned your last leg must end 15 minutes prior to the end of the 16th hour, cause at the end of the block there MUST be 15 minutes of duty. So your last leg must be scheduled to end before the clock strike 15:45 after your show time.

Keep in mind that if your airline has your show time as 11:00 and you clock in at 10:50 then your show time is still 11:00, not 10:50. This is because you choose to check in early.

People make these regulations a lot harder than they actually are.

How do we monitor it? That's why we need to understand the regs. Yes, the company will keep tabs on us, but they make mistakes.