How long should this item take to arrive?

I bought an item on amazon.com yesterday and it shipped today. The shipping time ffrom this seller takes 4 to 14 days for arrival and in the email it said i should be receiving my item between December 10 through December 28. I was ok with that because it has a chance to get here before christmas; but then i followed the email link to track my item and it said estimated arrival is december 28th. The shipper is 3 states away and they are using media mail (economy shipping). Do you think it'll arrive before christmas?