After a 15 to 20 minute warm up, the routine should be: What do you suck at? Is your Left Hand weak? Do you need to learn to read? Do you play heel down on the bass drum and want to learn to lift the heel and play on the ball? Do you integrate the hi hat foot into your grooves? Can you not get between the snare and toms with fluidity? What do you suck at? That's the question and that's what you put your time into.