You need to budget your time in order to manage your commitments because your time is limited, but your possible commitments are unlimited.
Do you really need to budget your time in the first place? There are at least 4 very good reasons the answer is a firm “Yes.”
If your schedule is both regular and irregular, you can budget your time by combining approaches for regular and irregular time.
Having an irregular schedule doesn’t mean you can’t budget your time. It just means you need to focus on the commitments that are most important.
Whether you budget your regular time with blocks or something else, you’re deliberately planning how you’ll use your time.