It's taken me more than two weeks in some cases. Because after a week of thrashing, a new hire will quite rightly get panicky if they aren't yet writing code. So one may just give up and accept a machine in a 'limping' state.

When I was younger and stupider, I accepted a 'limping' dev box for months at a particular new job, because everything was undocumented and I was afraid to ask for help.