I always recommend listening to one recording at a time until you experience the results you desire. My favorite time frame for conditioning is a minimum of 21 days in a row with the same recording. If after 21 days you are still not seeing 100% of the results you are looking for within that topic, continue with your conditioning until you do.
When we listen to too many different topics simultaneously it tends to dilute the results across the board so I would never recommend listening to, for example, a weight loss recording with a public speaking recording. However, a weight loss recording and a self-love recording would be a pairing that could work simultaneously. I still recommend listening separately for 21 days but I know many people want to dive in sooner than that, so if you do, just make sure the recordings are very much related.