I hope some knowledgeable people here say you're overdoing it, because I only do about 2-3min per exercise :|
If I'm working on something new I'll go a lot longer, but for my usual daily exercises (singles, doubles, triplets, accents, foot stuff, etc.) its 2-3min each (a lot of them tho).
I hope I find out that 3 minutes of practice on one exercise is good too. Cuz that would mean I could fit more exercises in the day. That would be YAAAY.
But I dont feel like im overdoing anything. Practicing is the funnest thing I do. Seriously. If I had a sound proof room I would neeeeeeeveeerrrr leaaave
I agree!. IMO, you are overdoing it. I do about 10-15 minutes of warmup before I get started on what I'm working on. Thats each exercise, ~2x through, at two or three different tempos.
If you are doing this much work and not seeing results, you are simply going through the motions of practicing and not using your practice time to critically analyse your playing and improve! The purpose of running exercises is to warmup and check your technique/tone.
There are more important things to spend 1-2 hours of your time doing than running exercises.