I can definitively "nope" this on it varying. There's a set timer that basically goes off automatically ever 10 minutes. A human will interrupt that if there is a mechanical problem, the wind gets too strong or there's lightning in the area. When it's reset to go on at the next "10". So for example, say they switch it back to normal mode at 6:33. The next time it will fire is 6:40. Wind is a major factor, even small bits of it.
This is not speculation.