it truthfully depends on how the people (and pets) in your home treat your furniture. the same quality piece could last 5 years in one home, and 50 in another.
do you dust/clean often? do you wipe up spills immediately? do you knock into furniture (yourself or whatever you're carrying/pushing/etc)? do you drop things on tables instead of placing them? slam drawers/doors?
if you're hard on your furniture it will show wear after a year or two (maybe sooner depending on the piece and quality of construction). if you treat your furniture gently, it truly can last 20-30 years easily. My hubby and I just bought a bedroom set...and while we are a bit worried about the construction of the drawers (they're not as much solid wood as we wanted), I asked him how much we'd beat up the dresser. we're laying shirts and pants in it, and opening and closing the drawer every morning/evening. is the heaviness of the wood REALLY going to matter if we treat it well?
Without knowing the quality of the piece, I would think something like a glider would easily last at least 5-10 years with 1-2 years of repeated use, and then occasional use after that.