Five minutes: find the outer ring
Start with D20, D16 and D8. Throw one visit at each target and cycle through them for five minutes. Count hits, but resist changing your technique after every miss. The purpose is to settle into your stance and release while aiming at three different parts of the ring. Use a timer outside the scorer if you want an exact 15-minute session.
Pay attention to where your misses land. If you aim at D16 and hit S16 with 32 remaining, your next target is D8. A miss outside the scoring area leaves you on D16. Practise recognising the new target before your next throw.
Five minutes: follow the finish down
Begin with 32 remaining in your head. If you hit S16, move to D8; if S8 follows, move to D4. Stop after three darts and restart at 32. Repeat with 40 and 24. This helps you practise choosing your next target after a miss. The checkout calculator can help you check a route before the visit.
Do not rush to make up for a missed dart. Step back into the same routine: identify the remainder, choose the double, then throw. If your remaining score is odd, an odd-numbered single is a simple way to leave an even finish. For 17, S1 then D8 is one simple route.
Five minutes: put it into a real leg
Start a solo 301 game with straight-in and double-out. Enter each dart to record your checkout and dart count accurately. Shorter legs bring you to a checkout sooner than 501. Play at your normal pace; if the session ends before the leg, save it and continue next time.
Try this routine twice a week and compare several sessions. A high checkout is worth celebrating, but finishing legs in fewer darts over several games tells you more about your progress. Use your results to decide which doubles need more practice. Add this routine to a four-week practice plan if you also want to work on scoring and accuracy.