Not too long. About an hour is probably the most I've spent but that was because I was experimneting a lot.
Depends but i guess usually like 30 minutes. Taking breaks to watch tv/go on the internet inbetween a couple times. I agree with the person above though, i usually dont stop until im done.
can take me a while as im newish to it but still doesnt ltake 3 hours lol like some as above its only 450 by 150 average theres only so much you can do