I wish I had mine today for 5-10 minutes for the icy patches I hit (see above), but with the warmth they would have overkill for 90% of my ride. Does using them unnecessarily on 'normal' conditions wear them at all I wonder?/
Carbide studs are reputed to last a long time. I ride studded tires all winter from December to March, nearly entirely on bare, wet, and/or salted pavement. My first pair lasted several seasons, and may be still useable.
However, now my beater bike is an aluminum Diverge Elite road bike and I have 30 C Schwalbe Marathon studded tires, the narrowest I know of. I've not had a significant snow challenge with them since I ride well-plowed roads, but the previous (?) 35 C tires were good up to about 3 inches of new snow. I really like the Schwalbe tires because I don't seem to feel the increased rolling resistance many claim for more aggressively treaded studded tires.