We have recently had introduced a low use inspection for c/s props in UK/Europe. It allows for a lot more practicality to be shown towards the calendar overhaul when not a lot of hours have been flown. It also means no blade strip, re roll and subsequent overhaul damage to the blade.
Most manufacturers have a 6 year overhaul period but if you buy new, the first 2 years storage does not start the clock ticking but it does after that.
Unlike engines, props can't go onto 'extension'. Time is the key.
MT have a low use programme, as do Hartzell. If you have a McCauley, expect corrosion with time, my shop said they were far and away the worst on inspection.