[0xFFFE]

You need to keep it fueled for it to maintain whatever orbit it gets pushed into. Orbital decay and everything.

[ethbr0]

Orbital decay comes from something. At some distance from Earth, you run out of somethings (most critically: atmosphere) decaying an orbit.

So past a certain distance, orbits are effectively "forever" ones.

It just takes more energy to get there, which is why the ISS is where it is.

[gameswithgo]

If the orbit is higher it can last for thousands or millions of years