Good question.
I guess you can only take a good guess about what your cruising altitude should be, since in reality "the farther/the higher, the shorter/the lower" doesn't always apply. (e.g. my flight from EDDV - EGSS (55 Minutes) went right up to FL 380)
For example, I determine mine by the type of aircraft I fly. Or I'll take a look into the aircraft's data sheet.
Generally 'though:
Turboprops: FL200 - FL240
Jets: FL300 - FL400
Hope I could help.
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