Thus why there is a late dining, MTD, buffet, and other options.
15-20 min late (maybe draw the line at 30-40 min late?). Not like the early dining crew has anything else to do for the evening. At least choose to sit at a larger table so others can appreciate the experience as well.
And mention to the head waiter that you've had a long day, need a shower and change of clothes, and would appreciate prompt service.