In our previous home we had a wood stove so it was REALLY dusty in the winter. I had to dust at least weekly, but usually cheated and used the vacuum attachment to dust.
Now I splurge and have Merry Maids come in bi-weekly to dust cause I just can't get to it. It's just so far down on my chore list I never get to it. I still have to vacuum at least twice a week with a 7-year old, 2 cats and a German Shepherd.