I've tried 5-6 and I just wake up feeling lethargic. 7-8 hours is optimal for me.

Do you homework on the county web sites and ensure you are not bidding on useless land such as roads, non buildable lots, etc.  

I recommend you attend some meetings (they are easy to find with a web search).

Hopefully, someone will chime in with some good responses to keep the optimism going

You may already be doing this but go to the county treasurers web site and download the updated list.

Craigslist is probably better because you can see what others are asking for similar properties in the area.But, in my opinion, the absolute best method to determine optimal rental price is historical data, which is only available on MLS.

Save my web url - www.GregWalterRealty.com.  

Here is pic of a roof with 3 or 4 layers of shingles I found on the web.

@Christopher DeLucien Welcome to BiggerPockets the Best Real Estate site on the web.

I'd look carefully at what you're doing and try to optimize it over time.