I’d make a candy bar last for the whole flight. Nibble, nibble every few minutes.
The nibble nibble trick doesn’t work anymore. I saw a guy try that on a flight to NYC the flight attendant said you have 5 minutes to finish your snack and put your mask back on. Disobeying a flight attendants direct instructions is a federal offence and she reminded him of that. She absolutely would have had him arrested on landing which is 100% in the flight crews power to do so. You then have to prove you didn’t disobey them it’s guilty until proven innocent with the FAA