The downtime lasted around 6 months to a year... 

Figure out a way to turn downtime/work time into learning.

Hiring a bookkeeper or a bookkeeping service may save money unless the CPA does it all in their down time. 

Maybe your father just needs some down time for a while, or maybe he's busy doing things that he's always wanted to do, like a hobby or volunteer work.

During this "down time", I have been reading, listening to podcasts, and researching online where I recently came across wholesaling.

There are lots of things you can be doing in this ‘downtime’ to get ready to hit the ground running.

Then perhaps use the down time for improvements.

A landlord’s goal is to get the highest possible rent but also keep the property rented without down time.3.

You should expect downtime between tenants longer with a SFH vs a duplex.  

Figure out the down time and associated lost rents, add the remedial expense including rehab and project out where you will be money wise and time wise; keep in mind none of this stuff goes as hoped.