Cool. I've been thinking at least 30 days up to 60 days. Maybe 45 days is a good solid number. That's a bit past the 5 weeks you suggested. 6 weeks I guess. 1.5 months.
Abandoning a game is gonna be like quitting. It will be scored as a forfeit. Which is a loss. The other player wins. But it's not quite the same as a real win+loss, so it'll be marked accordingly.