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Re:Target Venus not Mars for first crewed mission to another... by tuatoru on Sunday September 25, 2022 @05:15PM (#32976338)
> Engines running for long time ?

Not with chemical rockets. Perhaps you meant "engines sitting idle for years in interplanetary space, and then restarting reliably".

Re:Target Venus not Mars for first crewed mission to another... by s1artibartfast on Sunday September 25, 2022 @08:22PM (#32977946)
Really depends on the mission profile. If you are refilling in space for a "short" burn, it could still be longest in human history.