I have a warm-up exercise that seems to turn all the lights on so to speak, so I would probably play that. Then pick a rudiment, convert it into a useful lick or fill, and drill that in. Or rip open any book and play that page. Or, do what your teacher told you to practice *cough**cough*!
The warm-up is all four paradiddle inversions played on the ride and snare, over a samba.
Maybe you could find more ten minute spots in your day. Pad time after breakfast, master rudiments on your steering wheel, (it works!), do you Jojo Mayer bass and hi hat foot constant release drill on the bus or at your office, or his hand-clapping endurance drill.