Post one was an extreme example. If turn time was, say 2 weeks, it still may not be possible to receive the degree of verification desirable assuming some agent doesn't return calls, is on vacation, etc.
Most of them can be tracked down in 2-3 days, if necessary.
But how about a one week turn time over the 4th of July weekend? Good luck, if your best comps have incomplete/conflicting MLS info, etc.
It may be possible to do the report up to USPAP minimums, but not up to your normal standards due to turn time and the time of the year, weather, etc.
The appraiser's approach to fight back with CYA is no different than Fannie fighting back with Cert 23, etc. Even if he pre-checked the available data prior to agreeing to the turn time, decided he could deliver a report with credible results, I believe it is a material factor that the dimension of time is unusually short. It is worth mentioning.