How far was George falling behind on his tuition?

George had fallen behind approximately six-thousand dollars on his tuition.

Unpaid tuition fees kept accruing each year, and I graduated from Seton Hall with an unpaid balance of more than $ 6,000. That would cause problems for me during my residency, when the university would go to court, obtain an order, and garnish my checking account for half of the balance at a time when I really couldn’t spare it.