How long do I have to wait to get the US visa category f4 and our priority date is Jan. 01th 2001?

It will take approximately 11 years if you are from any country other than Mexico or the Philippines. For those two countries the wait is 15 to 20 years. Since your petition was filed in January 2001, you will have to wait another 1 or 2 years before your priority date is current, if you not from Mexico or the Philippines. If you you were physically present in the US on December 20, 2000 and are in the U.S. now, you will be able to file for adjustment of status when the priority date is current.