No. Generally, the due date stated in the "Letter of Acceptance of Sale" or "Letter of Intent to Sell" does not specify a deadline for payment of the deposit or purchase price. However, some sellers may require you to sign a sales contract by that date. When you receive a "Letter of Acceptance of Sale" or "Letter of Intent to Sell," it is a good idea to check the seller's intentions regarding the stated due date.
It is desirable that the seller and the buyer agree on the sales price and other terms and conditions, set a date for the conclusion of the sales contract, and be able to objectively prove this in writing within the validity period of the "Letter of Acceptance for Sale" or "Letter of Intent to Sell."