Ends up being just the right amount for what we need each month to keep our office diffuser running. We leave it running all the time because we found it keeps the environment more consistent but even so it doesn’t use so much and by the time we’re ready for a refill the next box has arrived. We’re about to move into a new office location that is about 1.5 times the size so may be purchasing a second depending on how the layout of the building affects things. Our current building has a long hallway with a lot of individual offices and still it permeates through all these compartmentalized spaces.