For me, it is not so much the time, but the game that is available. I work during the weekdays, so that's not an ideal time for me. Evenings work well, and sometimes the wee hours between 00:00 and 04:00.
From a game perspective, early on, I like slow, deep games. As the evening progresses, I go for shorter games (like NLE MTT 45-player full table, Turbo). I often finish up a session with cash zoom, knowing that if I'm no longer doing well, it is an easy quit.
Cheers,
ObbleeXY