as marc mentioned never let them see you sweat. (TOT) time out timer, my machines are set to 3min split PL's and never make them public. a machine you can remotely control over the air, second input or LAN/wire line. there are other alternatives like LTR controllers but that limits who can use the machine. on that note I've had my share of people who jam/have no respect for the time effort and $$$$ that goes into running a machine.