Consulting Question

I have recently been asked to do a side job for a local firm(NY Metro Area). The client is looking for me to do the follwing:
1-Build and configure a windows 2000 server,transfer all data from workstations to server, set up security/users, backup system etc.
2-Conigure 9 workstations to connect to the server(build 3 new machines) consisting of Win98 and Win2000.
3-Set up DSL connection/proxy server.
The wiring has already been done.
My question is how much should(and could)I charge for this work. I am expecting it to take probably two nights during the week or posssibly one day on the weekend.
Thanks in advance for the advice