I had a vehicle for sale.  I was approached by a woman who said she would come back at the end of the week to buy the car.  At the end of the week she came back and offered a deposit.  She said that she would come back in "a week or two weeks time" to pay the balance.  It has now been over two weeks and she has not called or come by.  How long am I obligated to wait for her?  I have had two other offers.  Am I allowed to sell to someone else since she hasn't shown or called within the timeframe she set?

Thanks

Heather