This is a common, but good question that’s been answered in the forums (worth digging around). For example, see the discussion and replies from Naney, Semple, and Johnston in the links below. In general: frequency, duration, and consistency (and patience) are your friends. If you’re using AeT as a proxy to improve fat max, nutrition plays a role too.
(Sorry, my account isn’t able to post links, so see the attached file.)