Timed practice is an item purchasable in the Lingot Store.
Race against the countdown clock up to complete exercises. Time gets added to the clock for each correct response you give. The practice ends when you complete all 20 of the exercises or run out of time. You earn 1 XP for each correct response. Once it's been purchased, it is accessible via the "Strengthen skills" button on the Home page.
Store description: See how well you do practicing your skills against the clock in Timed Practice.
This practice tests your ability to respond to exercises quickly and accurately.