Curlytips
After a few calculations I find I am getting about 1200 landings per tyre ( using the type of tyre you have chosen ).
As most privately owned aircraft fly about 100 hours a year and probably do 1.5 landings per hour this would give a tyre life of around eight years operating from hard runways and double that on grass making it probable that a lightly used aircraft operating from grass could be sitting on twenty year old tyres.