If you stated that to me as your dive leader then the first dive would add an extra 10 mins on limits provided the staff member on the boat was happy with that. I would also however be exceptionally annoying constantly asking your NDL's and air after 25 mins so that I could get an impression off your comp limits and your consumption. Second dive would be a lot more relaxed.
That sounds fair......Just when reading in my log book....I found the accident of this "experienced" diver who dove with me and he had a rubber thing in his ear, so the water can not come in his previous sick ear. At 15 meter he had terrible pain in that ear.
So maybe it is really necessary to expect always the worst of the customer....