Q: How many times a day can I turn off and turn on computer? Should I just leave it on the whole day?
A: Preferably not. It probably wont effect you too much but the general rule is that the longer the computer is running, the more crap is shoved into the memory and it will slowly get slower (especially if you are playing games). If you turn it off at least once a day you will get a nice clean start. Personally, if you are leaving it for more than an hour turn it off. It only takes 2 minutes to turn it back on.