>>I like to play chess for fun...
>
>I never had anyone with enough patience to sit with me and play, so I learned some basics but by the age of eight I was out of it. Later, amazingly, everyone thought I must be great chess player just because I'm a mathematician. I know a few colleagues who are - they'd be roommates on a trip, get drunk, lie in beds in a darkened hotel room, and design problems without a board.
>

>Likewise, no Sudoku. Just don't have the patience. I may be able to recalculate prices across currencies more or less accurately off the top of my head, but combinatory stuff like that, no. Not my cup of tea.

Try Bridge. Tournaments usually allocate approximately 7 minutes per hand (25 hands per session) but "friendly" home games are typically faster.