I can understand if regen is taking up to 3 hours...but is that "normal"?
I have an LS and regen lasts about 25 minutes and it does not affect operation. If I had a regen start soon before I was done working for the day, I would park it and let it run. But I have never had a regen in the winter. I doubt I put more than 20 hours on the tractor in the winter so may have just been lucky and not had it happen yet.
I never run at less than 1600 rpm or idle for very long. The part I find to be a PITA is needing to idle for 2 minutes before shutting it down. That is not a DPF issue but due to the turbo.
Hope I have not jinxed myself, but so far, DPF and regen have not been a big deal but then again, I am too ignorant to know better.