I clean every outing. Whether hunting or competition.
Monthly 100 yard shoots are generally decided by x counts.
No room for accuracy degradation or function.
As do I, with my guilt-edged target rifles. My more pedestrian .22 plinker/hunters pretty much only when they tell me they need it. The couple of autoloaders I own (including a gill gun) start to fail from the actions getting cheesed up before accuracy drops off demanding a bore cleaning. At that point the stocks come off, the innards get sluiced with a spray cleaner and mopped out then re-oiled and they're good for another thousand rounds or so.