I do the usual 1/2 hour a day to warm up my fingers and loosen my wrist, but sometimes even 15 minutes if I'm anxious to practice or I'm fast that day. I do a regular routine of the following, for your MAIN one scale (by main, such as for an important piece your working on)
this is a very helpful guide, so I recommend using it for everyday to every other day practice
1. Two octaves, HS, quarter, beat= 84, 100
2. Two octaves, HT, quarter, beat= 84, 100
3. Two octaves, HS, eighth, beat= 84, 100
4. Two octaves, HT, eighth, beat= 84, 100
5. Two octaves, HS, sixteenth, beat= 66, 69
6. Two octaves, HT, sixteenth, beat= 66, 69
7. Two octaves, eighth (RH) against quarter (LH), beat= 76, 84
8. Two octaves, eighth (LH) against quarter (RH), beat= 76, 84
9. Two octaves, triplet (RH) against quarter (LH), beat= 76, 84
10. Two octaves,triplet (LH) against quarter (RH),beat= 76, 84
CHALLENGE: Two octaves, triplet (RH) against eighth (LH), beat= 76, 84
Two octaves, triplet (LH) against eighth (RH), beat= 76, 84