Aircraft components need periodic maintenance, this should be the same for the pitot tube that is an essential instrument for pilots. So do you know when should a pitot tube go into maintenance? I can't find relevant information online
The pitot tube its self (the actual metal tube) can be affected by clogging as well as direct impacts or the dreaded pitot tube cover left on before takeoff but broadly speaking are just metal tubes and a somewhat "simple" part for what its worth.
In the US if you are flying IFR your pitot static system needs regular checks, this is generally when issues with the system (and potentially the tube) can be found and lead to replacement.
While some aircraft may have maintenance life schedules for pitot tubes none of the small GA planes I fly require them to be replaced. For planes not flown all that often corrosion can be an issue since they are generally bare metal tubes. The pitot tube should always be checked in your pre-flight walk around.