Although service every 25 hours (a bearing replacement usually) is officially recommended, its generally not necessary. Jetcats typically go much longer before bearing replacement is necessary. Each engine (and type) is different, but 50-60 hours of runtime is not unusual before bearing replacement is necessary. This is usually about a $600 job.

I have 3 P-120's and a P-80 and all have over 25 hours of operation without being serviced...

Bob