ok, so the puzzle 13 really get me frustrated. i wait and wait but still there is no puzzle coming up on the fire after its gone?

my question is:
1.) Do you have to keep the computer on. So that after 10hrs(fast speed) there will be a key on the firespot?

Cause I have to turn off my pc at night. It's lame waiting for the puzzle at 10hrs..

It takes a lot longer than 10 hours. The first guide that was posted was incorrect. The authors have updated it, so you might want to check it again.