I used to check mine every 2 weeks. It is 60 miles both ways and takes 5 hours to run my "camline". Now i have been using lithiums in my homebrews. Expensive, but they last at least a month. With the heat and bugs in the summer, i have changed to checking them once a month. I always move them if they haven't seen much action, and once bow season starts, i do check them every couple weeks.
The less amount of times you check them, the less you will be leaving your scent. I also try to take a stand with me every time out. Kill two birds with one stone.
Call me lazy , but i hate the heat and humidity, along with the skeeters. So i have changed to checking them once a month.