co2 tank life

Anyone have any input on the average life of a co2 tank?
Mine is the one that stands to about your thighs. I have a monitor so it only injects during daylight and as needed.
Thanks in advance!

do you have it running all day or at certain times?

I have a sentinnel chhc-1 atmospheric monitor, so it only runs at daylight and when levels are low. I have a 4.5x4.5 tent

It depends on the frequency of use. I'd say anywhere from a 1-3 weeks depending on a lot of factors. The size of tank, how long its on, the size of your room ect...