Studs are for sure a wear item. I've talked to a number of amateur/pro racing teams that I've had the opportunity to encounter and they all had a variety of recommendations for track time before replacement. My personal approach is about every 3 years, which for me is about 50 days.
Considering you found one bad stud, I would suggest you replace the entire set across all of the axles. We had a fellow instructor a few years ago at WGI replace all of the studs on one wheel after noticing a cracked stud only to loose the other front wheel due to another bad stud. He didn't end up having a good day.
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