I used to watch several races each weekend – F1, GP2, GP3, 3.5, Indycar, MotoGP etc. I’m a bit busier now, the less free time I have I now dedicate to other things as well, so I won’t be watching much.
I’ll watch a few practice sessions, most or all qualifying sessions, and all races, albeit some by rewinding the TV if I can’t watch it live. I’ll also watch a few MotoGP races, two or three F2 races. The Indy 500. Formula E is on Eurosport, so it’s easier to follow than junior single-seaters, so I’ll watch that if it’s on when I’ve got time.
I will, though, roughly follow all the mentioned series, as well as WRC, via websites and Weekend Racing Wrap :)