How long for a gut renov?

We are considering buying a 4 story brownstone in Brooklyn. The details of the house remain in tact, but the house needs a ton of work. For example, it needs all new plumbing and electrical. How long would it take (realistically) to put in new plumbing/electrical? Additionally, we would be putting in new kitchens (triplex and in ground floor rental) and redoing the bathrooms. We are wondering how long it would be until we could move into the house. We are not talking about the house being completed. Rather, simply livable (ie the plumbing works and the electrical has been redone). Then, when the contrators work on the kitchens/bathrooms and whatever else we want/need done, we would be in the house.

Also, total cost of redoing plumbing/electrical (disregarding the cost of renovating/adding kitchens/bathrooms).

Lastly, the house has “forced hot air” (and thus extensive ductwork). Is it possible to utilize these ducts for central air conditioning? If so, what is the cost to add central air?

thanks!

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