score:3
This is rather broad, and everyone has their own preferences, but a few things you could do include:
Upvote:0
Watch a movie or four, read a book, play games on your phone, talk to your seat mates, stare out the window....
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Sleep. Consider what longer flights are like (10 hours is nothing). Make up stories about your fellow passengers. Get in and out of your seat to annoy your seat mates.
The options are endless.