Astra 2.0cdti dpf regen info?

[Boroboy]

Hello all,
I've owned my 64 plate 2.0cdti elite auto for around a year now. So I'm getting quite used to the dpf regeneration function.
My driving style usually consists of longer journeys around 60% of the time. Although the other time is spent driving around town. Never usually do less than a 7 mile journey, even around town. My dpf seems to regenerate around every 1-2 weeks. Although It's not done on an intelligent basis. I.e I have been on a long journey. Stopped the car for half an hour. Gone on a short trip again, when I arrive home. I turn the ignition off. Hadn't realised it was in the middle of a regeneration, due to listening to my radio. Then he fan comes on, car then sounds like a hovercraft for around 2-3 minutes  As the car must have been in the middle of a dpf regen. Does this sound similar to other 2.0cdti owners? Or is there a fault? I've never had the regen light appear on my dash, no ecu lights. Car runs A1. No extra oil dumped into my engine. Annoying, none the less.