Not often. I only put 600-800 miles on my car a year. It will only wear the belt down faster the more you go full boost.
Heck, I wouldn't care if I replaced a belt once a year, but it's not even close to that.
The picture below is with a gatorback, creates twice the amount of dust compared to a gates green belt.
This was with a couple hard pulls.View attachment 1620433
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That's an insane amount of dust