You should strive to perform some form of exercise every day to boost energy levels and productivity, burn calories, and strengthen your body. The key to fitness is mixing up your workout routines and to give your muscles proper time for rest and recovery.
Your muscles are developed by breaking down your muscle tissue and giving your body the appropriate nutrition and time to heal. Your body rebuilds your muscles to handle more resistance by creating bigger stronger muscles. A general rule is to give your muscles 1-2 days of rest before strenuous exercise again.
A common solution to fit your schedule is to break your routines up into muscle groups. For example, exercising legs on day 1, back and biceps on day 2, chest and triceps on day 3, core on day 4, and shoulders on day 5 allows for frequent exercise, but gives each muscle enough time to fully recover.