Most amout of time.... in Wind Tunnels April 4, 2005 I did a 4way tunnel camp over Xmas with Gary Smith and Rusty Lewis. My three buddies and I each bought 1.5 hours to start off and then ended up purchasing another 30-45 minutes. It was pretty intense. We did 45 minutes the first day usually with just a coach and the second day we got some time in there together and doing 2ways. I think on the second day we any one of us probably did just over an hour of tough 4way training in there. Remember to stretch between sessions, it really helps.