Based on tests performed in NOAA test chambers, ExtendAir CO2 cartridges will last 2 to 4 times longer than an equivalent volume granular canister. As can be seen here, when compared to granules, ExtendAirs perform better as the conditions get more extreme.
				This graph shows the amount of CO2 in the breathing loop after being passed through a granular canister and an equivalent ExtendAir canister. The shaded areas represent +/- 3 standard deviations around the mean performance.