Mathew is correct unless it is a short sale, then your time period could be based on lender approval, so if you don't have the seller's lender approval yet then you don't really have an accepted offer and the timer period hasn't started.
Your closing date should have been agreed to in your offer. When you made your offer to purchase how long did you put down for your escrow period? Unless the seller countered you back changing the initial escrow period then your initial offer is your scheduled closing date. Example 35 days after offer acceptence is your scheduled closing date. Good luck!