Cleaning Rate for an Empty House?

I just cleaned a house and told them $250. Was that too much? It was a 4 bedroom, 2 1/2 bath, living room, dining room, office, and a wash room. It didn't have furniture, but I did clean all of the windows, swept, and mopped it. I started at 10:30 and didn't get done till 6. So was 250 a fair price?