The length of time that 20lbs of Wooden pellets will last in the pellet stove is determined by a number of things, such as the efficiency from the stove, the burn up fee, plus the temperature environment. On regular, a pellet stove will melt away in between one-three lbs . https://how-long-does-a-20lb-bag90123.wikibyby.com/1954710/helping_the_others_realize_the_advantages_of_how_long_does_a_20lb_bag_of_pellets_last