After 2 days, you can't delete posts.It would make sense to me that they have one thread, with the first post having the contact info and whatever other info they feel relevant in it, and the last post being the one that says their hours that day or week. And then delete that last post as it's no longer relevant and put a new post with that info. No point in having to scroll past posts from 2013 saying "hey guys, I'm available today" to get to the post that matters.
I leave my posts because I tend to add new selfies to them, every so often. I get compliments and new bookings based on the updates personally.
*Also sometimes schedules change or you are fully booked up.
Sometimes a girl will post a new thread with the updated schedule, that has changed from maybe earlier in the week.