Every time after I visit the dealer the light will come on, just as I pull into my driveway. They say they don't do anything but it only happens after a dealer visit and they plug their scanner in. Normal Regen on my van happens about every 300 miles city and about 600 miles at 65 mph going faster than 65 is a longer distance between regens from what I have seen, your mileage may very.
OBD fusion has a dpf capacity % when capacity reaches 75% regen should start, as I stated should and not will. When regen is done the % will go back to single digit. On the highway I have seen the capacity over 85% without a regen from reading the 3 dpf exhaust temp sensors and then back to zero for a fresh start.