If you aren't prepared to be flexible about pick up schedules then you need to be very specific in your listing and say it must be collected within X days of item ending. I usually end pick up items on a Saturday afternoon and say they must be picked up by whatever date the Monday week is as that gives them the best part of two weekends.

If you didn't specify a deadline then you can really only wait and if they don't turn up when they say they are going to open an unpaid item dispute if you want your FVF back.