As said, it really depends on several things;
For example I and three others build seven days, 5 hours each day, on a poorly documented reprap mendel kit (Not prusa), and we had a large work Shop to drill, cnc and so on.
The Printrbot kit took me two, three hours - alone. And even if I upgrade, I have the essential bits to do so (board, motors, extruder, and a printer too make the parts).