There is no specific time as it depends on many factors such as urgency to sell, pricing and many others.
As you are a Home Buyer, if there is a home you are interested in, you can have the broker or agent (preferably a buyers agent/ broker) help you determine and present an offer that might get you the home at the price you are looking for.
Licensed Real Estate Broker & Brokerage
331 Columbus Avenue, New York, NY 10023
Office: 212 721-3301 Email: firstname.lastname@example.org