Depends partly on the weather and partly on my schedule. Having a dog ensures that I walk a little bit virtually every day, but right now the dog walking is at its minimum--some days a quarter mile, some days a half mile. Once the temps cool down to be more temperate, I walk the dog 1-2 miles a day, and I go walking with my walking buddy 2-3 times a week for 3 miles or to the gym where I go 1-2 miles on the elliptical.
I try for 12 miles a week average, but last week was (I hope!) my low point for the year with less than 2 miles!

Got to start walking before it heats up--and whether the dog wants to accompany me or not.