It depends on the check laws in your state. Here in MT we have a 48 hr. check law, this allows you to run 2 lines, checking one each day. I only run one line so I check every day. By checking every day and gang setting every location you increase your catch considerably. Also, if you plan on checking (if legal) every 48 hrs. you should have laminated (offset wouldn't be a bad idea either) jaws on all of your traps to minimize injury to the trapped animals.
