Ah, I get it now. Yes, there is a timeout feature. If you leave a puzzle unsolved for two hours (give up on it and go on to another), it gets counted as an automatic loss. This only matters if you are going for 100%. What you did that time was leave the puzzle in an open page. That will run indefinitely. I think the current record is something like five hours. Ask Bansai.
Slotted spoons don't hold much soup. - Stephen Sondheim