This is a theoretical question based on things I hear a lot
Often I hear things such as "I'm really busy and don't always have time to practice". The feedback I usually give is for a practice session that's maybe around 10-20 minutes long, break a song you are working on into chunks and work on one specific chunk, and maybe one specific idea within that chunk (e.g. rhythm, articulation, counting).
I'm curious is there any other feedback I can give that can help people practice more efficiently and effectively to make the most of their time? For context, these are usually middle schoolers that I talk with. I've often heard in the various circles that I am in that the best way to get good at some concept in music is just to devote a lot of time to it and work with it until you acquire a better understanding, but that does not always work for some people.
What are good ways to practice well for people who dont always have a lot of time?