When wish is used to emulate a spell of an allowed level that has a lenghty casting time, what is the casting time for the wish?
The same as wish or the same as the emulated spell?
Wish only takes a casting of time 1 action to fulfill your Wish. In this case of emulating a spell with longer casting times, it bypasses that longer casting time because (PHB, 288). Emphasis is mine.:
You don't need to meet any requirements in that spell, including costly components. The spell simply takes effect.
Using your 9th level slot as a Wish for a lower level spell basically allows you to get what you want NOW (ignoring any casting times that it would have cost) and without any material cost.