That could add up quickly and might be difficult to do. 

It’s a great way to grow faster.HELOC or Equity Tapping: If you have equity in another property, using a HELOC or cash-out refinance could help cover the down payment without affecting your DTI as much.Seller Financing or Creative Deals: Look for sellers willing to finance directly, which bypasses traditional mortgage qualification hurdles.Scaling quickly often involves combining strategies—play around with what works best for your goals.

A prudent investor doesn't seek quick riches through shortcuts.

You seem to be asking a lot of questions, looking for quick shortcut answers. 

As far as timeframe, anywhere from 21-45 days depending on how quick a borrower gets their docs to underwriting, how long the appraisal takes, etc.

Yes, they will do many things better than you, but some things it's not possible for them to be as attentive and quick responding as you.Also, no one's perfect, so keep tabs on them in general.Regarding holding or selling: why did you buy this in the first place?

It took new construction costs from $800-2500 down to $325 / SF and instead of 2 years it can be done in 8-12 months (design, permits, fabrication, shipping, and erection) depending on how much homeowners customized the standard plans. 

If you are an experienced flipper and have a team of contractors that can get work done cheaply and quickly, that also becomes your competitive advantage. 

For example, if they need a quick sale, emphasize your ability to close fast.

@Esther Iroko everyone thinks it's easy to DIY manage their rental - until it isn't.You now need to learn on the fly and quickly!