Digital orders auto-complete 72 hours after dispatch, physical orders 10 days after delivery.
The auto-completion timers were tightened. Digital orders now complete 72 hours after the vendor marks them dispatched, and physical orders complete 10 days after delivery. If you expect to be away, the order page has a reset button that restarts the countdown, and it can be used three times.
Funds release to the vendor when an order completes, so if you are going to be offline for a week, read the listing carefully before you buy rather than after the timer runs out.