I've had my Ohlins R/T on my daily driven M3 for 3yrs and 40k kms now. Still going strong. 6 months ago I did feel the rears get slightly softer but firming it up one click fixed that. I run it at 12/12 for daily, 8/8 for hill climbs and 4/4 for track.
This is in contrast to Koni adjustables which I had in a previous car which was largely too soft by the end of 3 years.
I think it depends on what firmness you run it most of the time. Firmer settings result in more friction/heat which will accelerate valve and seal wear. So I expect Ohlins driven on track only will require more frequent rebuilds than primarily street driven units.
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