Chances are the bank will grant a reasonable extension of the loan (60-90 days would be good). But there are no guarantees, and they probably won't offer it unless the TP puts some pressure on them. The reason is, someone at the bank is going to have to explain the reason for the extension request and their higher-ups aren't likely to take kindly to their subordinates' lack of preparation. So it's easier for them to put the borrower under pressure, hopefully keeping the bank employees under the radar.
It it's a long-time, profitable, cooperative client, I might suggest a telephone conference call with the banker & client both on the line. That's the only condition under which I'd speak with the banker. The purpose would be to point out to the banker why an extension/modification of the loan is necessary, and that I've seen other banks do it many times. It might also be an opportunity to point out that this would be a good time for the client to shop the loan around if their bank won't work with them. If it's a marginal client, I might just tell them when I can have the info ready and suggest that they take the timing up with the banker.