Look, you're already there and you know your way around, so this is about reducing the stress of worrying while you're waiting.
If you're traveling with friends, take some of the pressure off by riding to the airport separately from them, especially if they want to leave later. That way, you won't feel compelled to embark on a journey that's more rushed than you're comfortable with.
Make sure to pack plenty of things to do to distract yourself too. Podcasts, sudoku puzzles, smartphone games, and good old-fashioned books can keep you entertained while you wait those 2 to 3 hours. And it'll be better to have these items on hand than to pay airport prices for games and books.