Because it’s moving very fast, it’s not stationary. Matching orbits takes time and you can’t really just gun it towards the station, that will just put you in a much higher orbit and take you farther away. You need to establish an orbit that’s almost the same as that of the station but ever so slightly lower so that you’re going faster to catch up, or if it’s behind you, higher so that it catches up to you. Then you have to wait until you’re close enough to burn towards the station and dock. Given the complexity of this 4 hours is actually not that long.
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