I like this method because it requires very limited cut and paste communication up front to notify them of the open house day/time and then attendance at an open house rather than individual showings.

I can't find any laws that require a ratio, other than having an operator available during daytime and on call at night.  

The day/time isn't set in stone.

I'm fortunately right now that working night shift allows me to have day time hours to do things like meet investors, banks, as well as look at properties and go to sheriff sales.

Our local power utility subsidizes the panels and installation and some people can sell power back to the utility during the day time.

The hope is to not have to work the day time job forever so I can spend more time doing what I want to do.

You can quit your job and live of REI, but it takes on average 10 years of throwing everything you have in time, money and energy into this endeavor.I quit my W2 in 2015 and learned very quickly that you can watch only so much daytime TV.

Even in the areas with higher crime statistics however, generally civilians are pretty safe in the daytime.

I do plan my visits to the rougher areas during daytime, and earlier in the days. 

As a daytime software engineer with a large oil and gas company and also owner of a digital marketing firm, I would like to retire by 40 and just let my money and time work for me via investments in multi family properties.