I think every 6 to 8 weeks is a good mailing interval for at least a 6 month period.  

Marc,  Our lease states we cans show the property during the notice interval, and access by the landlord is authorized for showings and inspections.The first step is to visit the property to "preview" it for the marketing, and you can note any big issues that may delay occupancy, and even stress to the residents what they could be docked for.I always tell the residents to protect their valuables because its hard to track other people's children during showings, and the more they cooperate and the faster the house leases, the less time they have to tolerate showings.I've had perfect houses occupied the next day.I've had disasters that need  six weeks to prepare.With this effort and a mid-lease maintenance inspection, there are fewer surprises.

Of course, those both those things aren't always possible which is why you'll sometimes see price reductions at regularly scheduled intervals but that is somewhat dependent on the number of previous offers, showing history, repairs, etc.

If you are a bookkeeping client, I will have either prepared your books myself or checked over your work at quarterly intervals throughout the year at a rate of $25/hour so that in February, I already know your books are pristine and I can proceed with analysis, data entry, review and offering opinions for future tax savings (assuming we didn't do a tax forecast in the fall like we should have).  

The software I worked on also lets events recur at regular intervals, so you could enter one event once; set it to recur, say, every 30 days (or whatever custom period), and then you'd be able to see on an actual calendar a list of what your day, week, month, or year looked like at a glance.Is this for rental properties?

And a scaned copy of all invoices should be sent to you monthly, or at least at regular intervals.

Do you know the exceedence interval that estimate is from (e.g. 100-Year Flood = 1% chance of water reaching that elevation in a given year)?  

Rent was cheaper, we required photos and inspections at various intervals and we also listed out in the lease agreement a work schedule. 

There might be a ways around this if sell this in more than 6 months interval and sell less than 50% LLC interest each time.

That's usually a good interval on termites to keep them controlled unless you see a specific problem beginning and need to address it.