I’m about 8 years in, have a pretty steady practice routine of 1-2 hours per day which I organize into 15 or 20 minute chunks. I’m curious about the efficiency of spending too much time on one thing versus not enough. For example, I’ve been working on Simandl exercise in 4ths on page 58 for several days. I’m 40 minutes into it today and can almost make it through the whole thing without mistakes, but could easily spend another 60 minutes or more. But I also want to work on some repertoire, which presents the same challenge with respect to “how much time to devote to this one thing before it’s time to move on, even though I don’t have this under hand yet”. How do you organize your practice time so that you are meeting whatever your milestones are but not spending too much time on one thing to the exclusion of other aspects of your practice agenda?