If everything is easily accessible and you can easily fish the new wires into place then you could likely knock it out and get the house rewired within 2 to 3 days.
Having someone to help you fish the wires would greatly help speed up the process if you can find someone to help.
I rewired a house a few years ago with a helper and it took me 2 days to get the wires all fished into place and wired up.
Probably would've took me a week without the helper to help fish the wires because I'd have to run back into the attic and then back down again whereas he stayed in the attic and helped me fish the electrical wires into place.