Upper Limit on Devices One Can Select and Monitor in SmartApp?

So I was working on a logging tool to Xively.com based on some examples here and due to the unreliable nature of subscribing to events, I was setting up a schedule every 15 minutes to grab device states like battery, temperature, humidity, etc.

If I select 10 or fewer devices it works, as soon as I select 11 or more, the smartapp just stops functioning. No errors or anything.

Is anyone aware of an upper limit on how many devices can be selected?

I’ll open a ticket with support as well, but thought I’d share on here and see what might be going on.

I believe there’s a run time limit for an application. When you process many device you probably exceed that limit.