What brake lines did they replace, the long steel line going through the frame from front to back, that could take a while but really should never need replaced. I would guess the three rubber hoses, one going to each front wheel and the one going to the rear axle. Those hoses are average $30 each, then you have to bleed the air out, replace the fluid, etc. Maybe $400 for parts and labor, espically if it had ABS so they had to hook up an expensive scan tool to bleed the air out of all the little valves in the ABS. I was out of town so I let a dealer charge $500 to change a fuel pump in my wife's van because it kept stalling. We got the van back and our full tank of gas was now 1/4 of a tank and I looked up the price of a fuel pump and it was under $100. The van still stalled too so I ended up having to fix it myself.
High cost of repair is why everyone now leases a throw away import, if it breaks then they just turn it in for another one.