I own both the peanut lighter and the split pea lighter. My experience has been that the o-rings hold out for years and that they'll light on the first try after six months of storage or more. Usually when I refill them at that point they're full, or nearly so.

Back when I was a smoker I would drop a spare flint into the body of my Zippo before reinstalling the insert after refilling. I've done the same with my peanut and split pea lighters.

I've no affiliation with Countycomm/Maratac other than as a customer.