Mileage Goals

So I've decided to set mileage goals for each week. As previously stated,

to keep my membership fee cheap at the gym, I have to make it there 3-4x a week. With work and other things on my schedule, I've been trying to figure out what a good goal for mileage would be each week. I've decided for the month of Jan I will try to hit 25 miles per week. I am already thinking after Jan I will have to increase this amount. I have been logging miles on the treadmill, bike, and stair master. (Tonight, I climbed enough stairs to reach higher than the Statue of Liberty.) I hope to add in some miles in the pool in the upcoming weeks.