Flip house w/ private well water

[Jeff Morrison]

I am considering looking into a house that I found to flip, that has a private well for water, it has public sewer.  Looking at the pics online, it looks like it needs approx. $60-70k worth of work.  I did go and see the house, just looked around the exterior.  Most of the homes around Chicago and suburbs have public water from Lake Michigan, except a few areas of suburbs that are unincorporated.  How much of an affect would this have on the timeframe once the rehab is complete and listed for sale?  Thanks!!!