Why does the timeline need to be so dramatically short? It doesn't need to take years or months, but executing such a change almost instantaneously with a new purchase is careless, crude, and risky.
It also reveals a lot about the mentality of the person making the decree.
Well, first of all, spend more than three days, obviously. If, for some reason, that was necessary (it clearly is not) use historical performance reviews.
Taking more than 3 days instead of rushing such an important decision.