What I just tested. Pre-heated @ 3 o'clock. 3 ELBs loaded 1/3 full. Unplugged/started timer. Stepped out into a very sunshiney day ambient temp 68.9 degrees. @ 1 minute huge cloud. @ 2:30 loaded next ELB and pulled @ 3:00 minutes, huge cloud. Loaded next ELB @ 4:30 pulled slower @ 5:00, huge cloud. Ran inside to fill another ELB and discovered I am fucking destroyed. Ran back out popped ELB in very slow draw @ 7:00 and got that very tastey warm blue vapor hit, exhaled pulled again same thing. Sunshine starting to have an effect up here in the clouds..... Obviously different ambient temperatures, pre-heat setting, how one hits and multiple users all come into play.