Buy yourself a book/DVD of rudiments, pack enough food for two years, move into your parents basement, and don't come out until you've mastered each rudiment up to 700/bpm on your metronome, leading with either hand.
................then!!!!!! Okay, just kidding, bro'...
What are you trying to accomplish, dude? If you're trying to master the instrument, that will obviously require a great deal of dedication and sacrifice. However, if you're just trying to be 'good enough', that's okaaaay ... but, I am not the one you seek, grasshopper. *bows deeply* Their is no need to prescribe you a Donati-esque practice regimen, if you don't have the time, nor the willingness to stick to it, absolutely. *bows deeply* Set attainable goals, dude - and you can only do that by being honest with yourself:
1. Are you easily frustrated?
2. Do you give up easily on thing's that you have trouble with?
3. How much time do you have per day?
4. How big of a priority is improving, to you?
5. What is your ultimate goal?
Answer these questions, honestly ...
*bows deeply*