I know the answer is "it depends", but let's say you are in a regular
light airplane (C152, C172 ...) with "real" aircraft tires and you do
normal landings without excessive load, speed or crosswind. It will
still depend on the surface of the runway, but generally, is the
number more on the order of 10s of landings (change rather often),
100s of landings (maybe get through one busy flying season with one
set) or 1000s of landings (last forever until aging kicks in)?

Oliver