Clean water left standing for a couple of days can shift to Category 2, which changes what gets removed. That is the practical reason speed on day one matters.
Class matters just as much for the schedule. A small Class 1 loss might be dry in two days, but Class 4 losses in dense hardwood, plaster or masonry need specialty drying and extra days. Your restorer should spell out both ratings plainly and record them in the project file.
Keeping Three Parties Aligned
A good project lead updates the adjuster, chases phase approvals and gives you a realistic move-back date. Ask at the first visit who that person is and how often you will hear from them. If the answer is vague, that is worth noting.