10-12 years easy.
The oldest one is missing the bail
and lives in the uncovered fire ring full time.
So far I've never hat a rivet fail.
(I'll regret saying that.
)
Currently own about 6 or 7.
Anytime I see one for under ten bucks I'll pickup another.
I've given several away to friends who used lighter fluid over the years.
They've never gone back.