My credit score is 800, my wife's is about 725. Just bought a house that we will be in for a long time, and we won't be buying a car for a long time.

How often can I jump on some of these miles deals if I am not worried about my credit score being negatively affected? Give me some insight from the pros!

FWIW, I solely fly United and prefer to earn miles for them. But I would be interested in earning on a couple hotels and for more everyday things like gift certificates as well.

Thanks!