During my two trips, I stayed in average 1.4 nights in the same place. It’s really fast.
For a project you will certainly need three or four days. You also need to plan the time you need to get the visa along the way.
Here is a small tool to help you estimate the length of your trip depending on your transportation mode and your rythm.
Km per day of transit (on feet: 30) (by bike: 100) (hitchhiking: 220) (by motorbike: 400) (by bus: 500). It’s an average which changes a lot depending on the mountainous areas, the infrastructures and as far as hitchhiking is concerned: the local culture.