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Do they have to stay seated & buckled the whole 19 hours? Dare I ask how they eat or go to the bathroom on the 19 hour trip?

No, there's room for them to get "up" and take their suits off. Eating is no problem, the food is basically MREs. There is a toilet.

>> they could have anything that doesn't create crumbs

Would you get a reference to M&Ms? I know SpaceShip1 was 16 years ago now. How time flies.

Bitesize candies that melt in your mouth but not in your hand would be a good choice. :)

Crew Dragon has a toilet.