I’m thinking it would be helpful to explicitly state your boundaries before even agreeing to play the game. Something like this:

“There are some board games i like and some i don’t. I’d be glad to give it a try if you’re ok with me deciding I don’t like it after 10 minutes and dropping out. Also i don’t enjoy playing board games that take longer than an hour to finish, so I’d be happy to play as long as you’re cool with me dropping out of the game if it goes on longer than an hour.”

If you explain clear boundaries to them before starting play then they know what to expect when those boundaries are reached

I’ll believe it when i see it