Warm the engine up to 90 and then run at low revs at around 50-60mph until the light goes out, trouble is it could be a 10 mile trip or 30 miles depending on how clogged up it is and whether you can keep the car at a stable 2500rpm. I've also heard that 3rd gear is best and take it up to 4,000 rpm for 10 minutes - perhaps try both.
The trouble is if the light does come on your car could be in "limp" mode within 20 miles and then it has to go back to Audi to be cleared and reset, if you don't it will blow the DPF and could potentially cause issues with the engine (if you kept driving it in start/stop conditions). You could clear the filter on a Sunday but with school/work runs and traffic it could easily be back on by Monday (in my experience).
DPF is a real issue, I'm sure Audi have made the cars less sensitive since I had mine in 06 however I would advise you go for the 2.0T Petrol and take the production delay now rather than have all the hastle. Mine was an absolute nightmare, I was driving it 50 miles a day and it still kept coming on! I have the diesel Q5 but I now work much further away and it gets 6 x 50 mile trips a week and I've never seen the DPF light come on.