Geostationary orbits are well beyond measurable atmospheric drag; the expected lifetime is on the order of millions of years. Geostationary satellites do have

Geostationary orbits are well beyond measurable atmospheric drag; the expected lifetime is on the order of millions of years. Geostationary satellites do have a limited oeprational lifespan, but it's not because of orbital decay, it's because they need propellant for stationkeeping to adjust for irregularities in the orbit, and that propellant is finite and eventually runs out.