I would suggest one reasonable run a month at that sort of mileage should keep the DPF happy, unfortunately there is no guarantee the thing will perform a regen during this time, it could decide to start one 300 yrds from your house as you return from an hour's journey...and there lies the flaw in the current DPF design in cars, no one has a clue whats going on...in lorries its different the state of play can be displayed on the OBC and a regen manually triggered on at least some vehicles.
You'd have thought the car makers would have sorted this 'no blighter has a clue what's going on' situation by now, they desverve nothing but abuse for their apathy.
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