This varies for everyone, and depends on how much time you have available, your fitness level, and your goals.
For general health, it's good to get at least 3 workouts in per week where you are pushing yourself and sweating. Moving in some way daily is good for your health and supports a strong immune system, metabolism, good mood and more.
Read my 10 Simple Rules of Fitness for some great strategies.
For an exact plan to follow, use one of my awesome workout plans.
And for personalized support, coaching, a weekly plan to follow and live weekly home workout classes, check out the Rock Your Life Fitness Program!