Some have partners across the country, some live in the property they are flipping, some try to automate as much as possible leaving more free time, others do all of the work themselves. 

Max dti for automated approval through GUS is 47% housing ratio and a 57% back end ratio (and this is pretty much everyone, lenders don't manually underwrite unless there is an automated approval issue) - even then 31% and 43% are just placeholders, HUD allows 37% and 47% by meeting residual income requirements and no further compensating factors on R/E loans, and you can exceed 37% and 47% (most lenders will cap back end at 50%, but you can go to 57%) with strong compensating factors, such as assets.  

Also learn generated automated seller leads

You have everything you want for free, all automated including accounting.

If interested i can help automating this with  an appointment reminder app, pm me if interested or google me searching for 1stbay

I would like to start requiring automated withdrawal for paying rent.  

For example, my team has built the business to the point where we have automated a lot of steps and have taken decisions out of wherever we can.

I also wrote software to automate keeping rental payments ledgers - and push it out to my on-site staff. 

Now the taxes have doubled...the kitchen floor has collapsed, and it is littered with needles from vagrant junkies.  

Look into automating your wholesale business.