I've seen this go mutliple ways. From my own personal perspective I remember growing up my dad had built our house. It went real quick until we got occupancy. (occupancy was granted very early on it too) But once we moved in it took years to complete. He built a lot of houses quickly for others and did some larger construction projects as well but on our own house it went on and on. Great house just a lot of loose ends. That being said we weren't flipping it.
I've seen this with others as well where they were flipping and just ended up staying there. Although anecdotal, it seems that way for most the people I know that have tried it. That being said I do have a couple friends that have done it well getting in and out in a few months even with a full time job doing almost all the work themselves. They tend to sub out the drywall taping, roofing and carpet the most.
Some other friends do the longer term live ins so they stay 2 years then sell for tax purposes. Seems to work for them.
I'd say what you do to fix it up might depend on what is bad, dated or even needed. How long you planning on doing the live in for? 2 years for taxes or quick flips? You own now or renting?