Today we test out 8 ounce Backpacking fuel canisters to see how long they last. The fuel used for this test is the MSR Isopro, which contains a mixture of 80... Jan 11, 2010 · I cooked once a day (dinner) and maybe a coffee at lunchtime, sometimes in the morning. one of the small containers would last me about 10-14 days. Most of my meals were Liptons which required about a 7-8 min simmer. With a spare gas container in the pack, you got gas for weeks on end!