At least 10 each get ran weekly. Others are once a month or so. Depends on the time of year and all. This has become a full time job to keep them all going. Also in the process of building a 100'x60' offroad track so we will no longer be limited on practice time. If it wasn't for these budget friendly receivers I would still be stuck trying to keep track of what transmitter goes to what. Life is much less stressful now.