Can I take my retainer off for a few hours?

I just got my braces taken off January 19th after having them on for 2 1/2 years. My orthodontics told me to keep them on 24/7 until she deems it ok to just wear at night (presumably 6 months). I've been responsible with my retainer, only taking it off to eat and brush/floss everyday but in a couple months I'm going to be seeing BvS and that movie is nearly 3 hours so I want to know if it would be ok to leave the retainer off whilst I eat popcorn during the film. I would put it back on right after and drool isnt a concern to me because I rinse it with hot water before putting it in the case (its my mouth) and I clean it twice a day.