My new alchy stove made from Miller Lite aluminum bottles got its first field test on Wednesday. I used it to warm up a can of beans on a day hike with an inch of snow on the ground, gusting winds, in 27 degrees F, at 3200 ft. It took more time to prime than at home, and I doubt it would have made water hot enough for pasta, but I call that a successful test in extreme conditions.

At home, it bings water to a full boil within 4 minutes of lighting it.
"Just enough to stay warm, dry, hydrated, and fed."