I agree with smoundzou, depends on your goals. However, the problem of doing HIIT 5 times a week together with lifting is that you risk overtraining. You may not notice it straight away but the intensity of the lifting session will suffer if you pursue this frequency of HIIT for a long time. Have you considered alternating the frequency of HIIT on a weekly basis ? 5X one week, 3X the following week, and so on? That way you: a) cycle HIIT, cycling is always good as it prevents the body to adapt to a particular routine, b) are less likely to overtrain