You should do your best to not restrict showing times. You should also approve all showings unless it is absolutely impossible to show. It is very important because buyer agents set homes up to show in sections and need to make the best of their time and the buyer’s time. You should also not reschedule for this reason as well. This area has a lot of out of town buyers also. This means if buyers are only in town for a day or two you might be sending a potential buyer home without previewing your home.