I'm not in the business of space mission engineering, so I don't know details. Sorry. But in general, you can control the error and make a trade-off between co

I'm not in the business of space mission engineering, so I don't know details. Sorry. But in general, you can control the error and make a trade-off between computing time and accuracy. You would select a timescale over which you want the error to be below some value, and then only consider the simulation valid until then.