my method has changed since i switched to a manual, which gives me more flexibility. I can draw for 8 or 9 seconds with my manual volt X2 if i want. Some juices get very harsh after a few seconds of draw, in that case i activate for a few seconds and deactivate up to a second to let the coil on my carto cool down a bit. sometimes i click on and off rapidly. How long the draw is depends on the liquid and whether the carto is clogged at all.