In the "Coolest Gear" thread I claimed my Jetboil would go "From packed to hot water is less than 3 minutes."
Roger replied "That is based on Jetboil's marketing spiel, not your own personal experience, right?"
Thanks for calling me out on such a wild claim. I don't time such things in the field, so the three minutes was an estimate. In my top secret product testing laboratory (kitchen) test it raised 700 ml of ice water from 32F/0C to a full 212F/100C rolling boil in 4:04 from lighting the cold stove, consuming 7 grams of fuel.
If I'm just going for a hot drink I use about half that much water, and it is usually more like 50F instead of ice water; I estimated the 30 seconds for stove assembly and 2:30 for heating. Tomorrow morning I'll do a more rigorous test of my claim, including time to assemble the stove and fill it with water.
The tests were last summer with a new stove and full 100 gram can of "Jetpower" fuel. I did several tests to figure out how much fuel to carry. Repeated bench tests showed that less than full throttle was most efficient- 3 cups/700 ml of ice water consistently required between 6 and 7 grams to full boil. I now use the 110 gram cans of Snowpeak fuel.
Recently I paid my BPL subscription so just yesterday I read Roger's original review and test of the Jetboil: http://www.backpackinglight.com/cgi-bin/backpackinglight/jetboil_stove_review.html
Also I will use a fan to test the performance with and without my recently constructed 8 gram wind screen. The wind screen is simply part of a stainless steel hose clamp that wraps 2/3 of the way around the heat exchanger air outlets. It blocks about 1/2 the vent area, which I think will keep the flame more centered in strong breezes.
The springy metal band just snaps onto the cup. It can be slid up or down to vary the amount of vent blockage. The slots in the hose clamp seem a neat feature for allowing partial venting, but a solid strip of titanium would probably work fine too. For travel it stores neatly in the top of the stove.