[Discussion] When you practice is it better to do a bit of everything or focus in on 1 thing for the whole session?

What do you do? I think I tend to just focus on 1 thing for the hour or however long. I rarely touch all the "topics" in 1 day. For me the some topics would include, chords inversions, sight-reading, rhythmnic practice, picking technique, scales, vocabulary (lift a solo).