I use Google Calendar a ton for reminders and notifications to confirm transfers/deposits. 

As a matter of fact I just looked at our calendars and laughed.

Great ... thanks @Steve Maginnis ... got it on the calendar. 

The options are: Calendar year: Jan. 1 to Dec. 31.Fiscal year:12 consecutive months ending on the last day of any month except December.4.

You can look at their rental rates and calendar to see how much they are being rented.

Each exchange will have it's own 45 and 180 day calendar. 

Otherwise you make a lot of dust and do a lot of work but benefit less then if you just sat tight and let the calendar make $6K for you.

The Book I recommend is What Every Real Estate Investor Needs to Know About Cash FlowFor Economics, I recommend reading things from the Economic Calendar from Bloomberg: Bloomber Economic CalendarEconomics is very difficult at first, but will take some time to absorb it.

Would you be willing to subject yourself to this calendar for $10K?

However, since we each answer phones, book our calendars, and perform the work, it is really an all or nothing type position.