Forever.
My favorite things as a youth were guns, electric guitars & playing in rock/metal bands, fast cars, and 2-stroke dirt bikes. Didn't use hearing protection very often with 9mm/.45 ACP/7.62x39 or hunting rifles (not many shots per day for these) back then. It's a miracle I can hear anything! I can actually hear quite well, although there is some high frequency loss for sure.
Now many years later, no change in my interests.
Well except I don't ride dirt bikes much, but I still love 'em. And I've been using hearing protection religiously since my mid 20s.
A lot of other things can contribute to tinnitus, including age, caffeine intake, ear wax buildup etc. I've read that taking magnesium can help with tinnitus for some, and I think it does, along with reducing caffeine and professional or over the counter ear wax removal every now and then.
Oh, and I don't skimp on ear plugs/ear phones. Buy which ones you think are the BEST.