ITA 4 days is pretty a generous time period for a "normal" SA to offer.
I got a call earlier this year and was offered a Kelly from a store that I am a new customer at and the SA said I had to decide *instantly* and had 24 hours (or less) to get to the store and pay/pick up>>>> I laughed.
Now, I was "local" to that store but still 1 1/2 hours from the boutique in very heavy traffic. I had kids to pick up from school, they had after school activities, it was not going to happen. It did stress me at the time but I told her I absolutely wanted it but I just couldn't get there the next day so she ran my CC that afternoon and I picked up in a week or so. She had to get the Director's approval of course.
My "real" SA though, where I deal most, could hold for a month for me no prob. But he is THE ABSOLUTE BEST, so....
I guess it totally depends on your SA's ranking at the store. From my experience the Directors can literally move Hermes mountains and the regular SAs are under the thumb of the Director so what he/she says GOES.