Depends on the game.
Lately I've been playing Game Dev Tycoon since it can all be done with the mouse. I have an 11 month old that demands my attention, and a 9 year old that likes to creep in and watch me play. I want to finish South Park: The Stick of Truth, but I don't want him hearing the language and seeing swinging balls.
With games like Game Dev Tycoon I can play for a few hours while spending time with my sons. Sometimes I can play my Vita a few hours as well, but my PS4 time is minimal.
Starting this weekend, I'll probably delve into a JRPG, so my daily playtime will jump to around 2-3 hours/5+ on the weekends.