The move out timeframe should have been disclosed to you in writing. Are you the homeowner or a renter? If you are a renter, check with the Landlord and/or the Agent handling the sale of the property. This timeframe varies and it's completely based on what was negotiated in the contract. Depending on who is purchasing the home, you may not be required to move. You may be able to negotiate amicable terms to stay.
If you need further assistance, feel free to contact me. I look forward to your response
The "HUD" Queen
Tally Real Estate Group, LLC