A couple of weeks ago I spent 3 nights mooch docking at a friend's place. Didn't run the generator for any of those days. After 3 days without a recharge, when I plugged the coach in at Mt Laguna the converter went straight to Boost mode for a couple of hours before it dropped back to Normal.
In normal day to day operation, it seems like in the evening, when I'm running a few lights and the furnace the charger stays in the "Normal" mode. During the day, with nothing 12v running in the coach, it's indicating the "Storage" mode. That seems to be the normal pattern.
The only thing I see in the paperwork for my converter about timers is for the Equalization mode, which is supposed to operate about once a day or so for a short time.
My Interstate GC2's(1 pair)are approaching 6 years old, and I was highly surprised that I could run the coach 3 nights without the generator. Wasn't running the furnace at night, but I ran it every morning when I got up to take the chill off the coach.