User blog comment:JmLyan/Tayse, the Crystal Refiner/@comment-24896347-20140627043151/@comment-7481207-20140627140446

Well, its more of a 5 seconds "stay out of my way", if an ally is careless and attacks just after you land the stun, it will last shorter than the ordinary stun.

Also, remember that having 5 flare crystals will remove them all after casting one spell and that the W and E each removes one flare crystal per cast, so the full rotation wouldn't get the maximum damage boost on all three abilities. Two of her spells are also unreliable (not counting the AoE part of Q), and they are her only CC that could help landing those spells.