Thousands of years. That’s good, because when it runs out, it’s gone, into space.
> when it runs out, it’s gone, into space.
We should follow it then, heheh. Cheap fuel pump design utilizes pressurized helium, beats turbo pumps in certain useful scale regimes: https://rocketfuelpump.com
From the article: "Much of the helium present today is a result of radioactive decay of elements such as uranium."
Maybe we could bury our nuclear waste and harvest the helium. Two birds?
;-)