Nor are you legally bound to proceed with a purchase if and when your offer is accepted. As a result, there’s very little reason not to test a seller with an offer if and when you come across a suitable brownstone.
You can retract your offer at any time at any point until there’s a fully executed contract.
Upon submission, the listing agent will typically reply rather quickly with a simple acknowledgment that the offer has been received. Thereafter, it usually takes around 24 hours to receive a response from the seller.
Keep in mind that the response time and general responsiveness varies by seller as well as the amount of competition from fellow buyers. Similarly, the number of rounds of back and forth depends on a myriad of factors such as the competitiveness of your offer and how long the listing has been on the market.