Minimum two hours unless I can't be on the computer for some reason. Generally ends with around 6-7 hours with some afk time resting hands inbetween. I'd say at least 4-5 hours of actual play time, with some variance ofc.
I have my own quota wherein I should spend about 8 to 12 hours a day,but thanks to school during weekdays,I only play an hour or two. I go all out playing during weekends and holidays though. And within those hours; 50% of the time playing, 40% doing something else ,5% listening to music and 5% when spectating random people out of boredom.