RE: how often
The answer to your question is yes. Try to figure out which way the wind blows most of the time. Set your stand down wind of the scrape. The reason for this is that bucks will sometimes wind check their scrapes. They will circle down wind to see if they can smell if a doe has visited the scape before coming on in. If you set up right on the scrape you may never see the buck if he circles downwind. Try this technique and hopefully it will work for ya, let me know how it goes.[8D]