Should I only play on days in the casino when I plan to play a lot?

The answer is different if you're playing on a cruise ship versus playing at a land casino. On a cruise, no matter what, your daily play is going to be the theoretical divided by the length of the cruise. So you could play 10 minutes one day and 10 hours the next and it won't affect your ADT, so play as you wish. It's a land-based casino then yes, 10 minutes one day would affect your offers from them.