Many of my students complain that they don't have enough time to accomplish their daily practice goals. My approach to this involves something called The Time Vulture. Make a detailed schedule of your entire day, and look for potential dead time. Then, descend and scavenge!
I recently had a student that was struggling to get through his assignments. I challenged him to add 15 minutes to his usual 2 hour routine. He was able to find that 15 minutes pretty easily, and used it to for additional scale practice. In a single week, we both saw obvious results.
This only works if you are honest about what you do with your time, and make a real commitment to use that time every day. How much open-ended time do we spend at the computer, texting, and watching television every day? Even if a young student can stretch a 30 minute routine to 35 minutes, there will be measurable long-term benefits.
For perspective, a college student that increases their routine by 15 minutes, for just five days per week, will add over 17 hours of practice to a single semester . . . Practice Monster SMASH!!!!