That's one of the key components to success or failure IMO. Those "burnout" times is where you have to dig down deep and keep the enthusiasm. Personally I never get the burned out syndrome. I get frustrated at times when things aren't coming together as planned but that just drives me more than anything. I never lose the passion to be in the woods. I could go a week without seeing a single doe and still be heading to the woods with the same possitive mindset. Patience, persistence, and determination.