A very long way, especially as drivng thru mountains takes a long time, on the map Bansko looks quite close to Borovets but is good few hours drive, Pamps is even further on the map.
I went Boro in Jan 2007 the snow wasn't great till thend end of the week, up top was ok but the gondola was shut for few days due to high winds.
People were getting buses to just around the corner the other side of our mountain about 20k and took them an hour.