You do realise that even something as small as the visual star vs the ILS star can change the fix crossing time by over a minute, and a change in runway can affect the fix crossing time by 3 minutes, don't you?
I am not sure that I understand your point. Do you mean the time
required by ATC will change?
For a Julim 5A Star, the feeder fix is for Julim whether it is for runway 21 or 03. If the aircraft in the stream are seperated by two minutes then that is constant. As Bloggs pointed out the decel rates are then the issue and what happens inside 15nm.
I have lost count of the times I have been slowed after the feeder fix and then arrive at Woora with nothing between me and the threshold, that is 15nm space infront.