I'm sure most people are aware of coronavirus and its recent effects on the stock market. I'm nearing signing a PS agreement and am contemplating asking for an extension from the seller (30 days?) just to see what the market and interest rates will do.

Are others in similar situations now or have been in the past? How would you deal with it?

Assume that the seller doesn't have ready buyers lining up and that the deal will likely still be around at the end of the extension period.