The time limit for the Cannon's Core is 7 minutes. This is a pretty huge stage so you must use time wisely. We will tell you the approximate times to finish each stage. From Tails' stage, times for each is 1:15, 3:00, 4:15 and 6:00. Check your times at the end of each stage and judge how fast you need to proceed. You may need to go faster or just play it safe.