Curious to hear folks reponses. I've hunted with success less than a mile from the truck/trailhead all the way out to 10+. Generally though, when I'm looking for new country I like to be 4-5+ miles in.
I keep it within 5 miles unless I have a buddy to help pack out. In that case we typically push limits of around 8-10. My honey hole is about 4 miles from the trail head. I hunt the whole way into my spot though. Last year I had the herd less than a half mile from my trail head though.