My experience of DPF's (a BMW and a Kia) clearly shows that a regen takes place every 250 to 300 miles however you drive the car and takes about 20 minutes to complete. To complete a regen requires you to drive at between 1500 rpm and 2000 rpm, if the revs drop too long (like they will when stationary) the regen will stop. After about 3 attempts I am told the engine light will illumunate but have never had it happen in almost 7 years.
My commute is 14 miles each way and takes 30 minutes, regens happen as needed and have time to complete.
But in your daughters case I would buy a petrol. The VAG TSi engine in 1.2 and 1.4 formats is superb in both the Golf and the much cheaper (but no less good) Seat Leon, I have one now myself.
Try one and be surprised. I get 45 mpg. WOuld take years to recoup the extra 2 grand needed to buy the diesel and I have no DPF worries.
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