I may stop the first time after 15 minutes or it could be three hours. When on a private charter you are on the hunt all the time. In less the charter is for bottom fishing only. You generally know where they are. The incentive makes them work harder.
Guide lines are along the lines of resturants.
If you are just plain unhappy let us know by not tiping. Tip based on precieved effort not on the catch. There are days the fish just don't bite. On my boat either the Capt or Mate. We split all tips down the middle.