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I can only say for myself your warm up would be extremely boring and tedious - that's mental exhaustion for me.
My suggestion is cut your scales, etc... down to only a couple times a week.
Possibly pick etudes and short tunes you know that use different Keys and challenges to concentrate your intonation on - mix it up & keep rotating in pieces you haven't played for a while, or had set aside.
Guess I tend to to try to kill 2 birds with 1 stone - fun and technical merit.
Hope you'll allow yourself "creative mental breaks", play some overly simple tunes that you can try changes/experiment on, just for fun!
Attitude is everything - hard work can be fun!
...be a little creative in everything you do.
I aim to spend about one-third of my practice time on scales and etudes, which typically means 20-30 minutes when I'm on my normal practice routine (currently not doing it because of injury).
The way my practice sessions have been organized, for most of the time I have played, is: start with scales and etudes for 20-30 minutes, work on repertoire for 40-60 minutes, and then if necessary finish with 5-10 minutes of exercises on a single technical issue that I may have encountered while practicing repertoire.
I do not go through the entire set of scales and etudes I'm working on each time I practice, but rotate scales and plan to give each etude a certain amount of time each week. (I may practice an etude every day if I'm trying to improve one particular aspect of my playing.)
Similarly, I do not go over all of my pieces in any single session -- in fact, unless I'm just about to audition or perform solo, I don't play through the entirety of any piece more than once every week or two. I focus on shorter segments with the most time devoted to the trickiest passages, and have been known to spend an entire practice session on a single measure of music. If I were to play through everything I'm working on, it would eat up all my practice time without any opportunity to work in detail. Instead I just plan in advance to play through a piece on a certain day.
Thank you both for your replies, I am taking on board your advice, especially about rotating practice of pieces and working on specific parts rather than go through every single piece every time. I need to put in more quality and less quantity I Ithink, and as Andrew does with his, structure my practice better.
I have replied to this post once already today but for some reason my reply has dissapeared