Parked Regen

I have a '15 Cascadia with 168,000 miles & will be 3 years old in June. I am, for the most part a local guy with some short regional runs about 300 -350 miles & over night MAYBE once per week, usually only about once every 2 weeks. So, we did not opt to have a GenPak installed etc. I idle EVERYTIME I am out over night & the small company I work for supports that.
95% of the time that I am out over night, if I idle more than about 8 or 10 hours, it requires a parked regen. I am assuming if it did a rolling regen just before I got there & its a fresh regen & I dont idle more than about 8 hours or so, I may get by without it. But, I can count on a parked regen if I idle more than 8 hours or so in any situation.
Get used to it.

Now, as per the way you are supposed to do it as I understand it, if you idle up to about 900 rpm's while parked over night, you wont have to do a parked regen. It will auto regen as needed... if needed. However, count on somewhere between 2 - 3 gallons of fuel per hour. Over 10 hours, 20 - 30 gallons of fuel @ $2.50 per gallon... you do the math.
If you're gonna do that, get a hotel. Its cheaper.
Idling over night at low idle, figure on about 1 gallon or less per hour.