I've never had a co2 tank run out during a weekend (I wanna say it's a 10 lb tank?). That includes numerous tire rotations (travel tires off, wheelin' tires on, then back again), airing up a couple times, other peoples' repairs, etc. You just have to keep in mind that the amount is still finite. I use a breaker bar for both starting and finishing the lugs (where I'd be wasting the most air) and use the impact to mostly make it all go much faster. :cheers:
I do have a cheapie 12volt air compressor as a backup for airing up the tires. :thumbsup: