Depending on the carrier, these may be done annually, or at random intervals. 

Most rate changes happen in intervals of  and ideally, you'll want a + for competitive rates.

Regarding the cleaning, have a handyman come out on whatever interval that is necessary.

If someone reports you, they will come out and verify you have disconnected the utilities and then come at random intervals to check on you.

The wholesale electric rates depend on location and time-of-day in 5-minute intervals.

Instead of saying you would attend and continuing to ask @Joshua Dorkin and @Brandon Turner when and where, I like the model where members host local and regional casual meetups at regular intervals to grow organically.

Typically, I write my leases in 6 month intervals with a month to month from then on.

I could write a book about the changes, but the important thing is to understand that they happened, they are constant, and there is a regular interval to them.So part of the answer to question 5 is to recognize that change is constant and that it cuts both ways.

Book appointments with eight minute intervals.

As someone else mentioned maybe increase your inspection interval for this property so that maintenance issue don't pile up and blind side you.