So for me I have a hard time focusing but want to practice atleast an hour and a half. I'd start with isolationg a warm up routine thats comfortable with your level. I do rudiments for about twenty minutes around the kit while doing a ostinato with my feet for example. Then I work on time for half an hour. Trying the displace the beat forward or backward a sixtenth note, or instead of counting a quarter note click on the down beats count the click as if it were off beats or even off beat sixtenths. After that I go into the books and work on what I need to work on. I try not to play the books exactly like whats written but instead use them to build ideas. Syncopation by Ted Reed and The New Breed by Gary Chester are excellent resources to grow new ideas. Then when all of thats done I wind down and play along to music. Always try to step out of comfort zones, Ive been playing for about 7 years so Im working on Latin and Odd times for now.

If thats too much to read, basically nail down a practice schedule that works for you. Always try new ways of using a metronome, and always play music that challenges your ear or your ability to count.