If the offer hasn't been accepted,, and the acceptance communicated to you, there is no obligation on your part to leave it out there. It can be retracted by noticing the Seller or Seller's agent in writing that the offer is retracted, right up UNTIL YOU HAVE BEEN NOTIFIED THAT IT IS ACCEPTED .
****AN OFFER IS NOT A CONTRACT UNTIL IT IS ACCEPTED. IT IS STILL NOT A CONTRACT UNTIL THAT ACCEPTANCE HAS BEEN COMMUNICATED BACK TO YOU. THAT IS WHY YOU ARE ASKED TO ACKNOWLEDGE, BY SIGNATURE, YOUR RECEIPT OF THE ACCEPTANCE, MAKING THE CONTRACT BINDING.****
Anyone who tells you that your offer cannot be retracted before you receive notice it is accepted, is trying to prevent you from doing something you are legally able to do, and they are probably not to be trusted for ANY advice or agency representation. If you are not given the absolute freedom to retract the offer before acceptance, you were possibly given inaccurate or manipulative encouragements to make the offer . Look to see who would benefit from you NOT retracting the offer. If this person is your agent, you have cause for legal action for violation of their Fiduciary Duty to you. They could lose their license, and owe you damages.
ALWAYS RESERVE THE RIGHT TO CHANGE YOUR MIND IN YOUR MIND, UNLESS YOU HAVE MADE AN UNCONDITIONAL LEGAL OBLIGATION OR COMMITMENT. MOST PURCHASE CONTRACTS GIVE THE BUYER MORE CONTROL THAN THE SELLER, TO PROTECT THE BUYER, AS THEY DISCOVER IMPORTANT OBJECTIONS, INCLUDING DETAILS ABOUT THE PROPERTY, AND THE AVAILABILITY OF THEIR PURCHASE LOAN. BE AWARE OF CRITICAL DATES FOR OBJECTIONS, AND DO NOT DEPEND ON OTHER PERSONS TO TELL YOU TO OBJECT WITHIN THE TIME ALLOWED. KNOW EVERY TIME WHEN YOU CAN SAY NO, AND THERE ARE USUALLY MORE THAN ONE. ASK QUESTIONS ANY TIME YOU ARE UNSURE.