not saying drey00 is doing this, but I just thought that there should be a time-limit so someone doesn't claim next, then get distracted and forget while others are waiting. So, the time limit between a "next" call and the picture post will be no more than 20 minutes, unless that poster gets on again to request a little more time, in which case an additional 10 minutes will be granted before someone else can jump in...
So 20 minutes time limit, then a 10 minute extension upon request.