Thank you for your patience.
While parties can agree to different terms by the contract they enter into it, Washington State law (I linked you to the statute below) says that within 3 business days of receiving the property transfer disclosure statement from the seller, the buyer will either accept it, or has the right to cancel the contract.
Delivery of disclosure statement—Buyer's options—Time frame.
Unless the buyer has expressly waived the right to receive the disclosure statement, not later than five business days or as otherwise agreed to, after mutual acceptance of a written agreement between a buyer and a seller for the purchase and sale of residential real property, the seller shall deliver to the buyer a completed, signed, and dated real property transfer disclosure statement. Within three business days, or as otherwise agreed to, of receipt of the real property transfer disclosure statement, the buyer shall have the right to exercise one of the following two options: (1) Approving and accepting the real property transfer disclosure statement; or (2) rescinding the agreement for the purchase and sale of the property, which decision may be made by the buyer in the buyer's sole discretion. If the buyer elects to rescind the agreement, the buyer must deliver written notice of rescission to the seller within the three-business-day period, or as otherwise agreed to, and upon delivery of the written rescission notice the buyer shall be entitled to immediate return of all deposits and other considerations less any agreed disbursements paid to the seller, or to the seller's agent or an escrow agent for the seller's account, and the agreement for purchase and sale shall be void. If the buyer does not deliver a written recision notice to [the] seller within the three-business-day period, or as otherwise agreed to, the real property transfer disclosure statement will be deemed approved and accepted by the buyer.
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