... huh. I kind of hadn't even noticed ... weird. Anyhow. It used to be that Laes and Leal would straight-up knock you out unless you resisted all of the damage; you'd be out for a number of minutes, what they have as being the duration, 20 x 1d6 for laes, 5 x 1d6 for leal. Since they've converted the 'you're unconscious no matter what' into straight-out Stun damage, the unconsciousness duration is kind of silly, and pretty clearly an artifact from previous editions.
What I'd do (plan on doing, anyhow) is to eliminate the Stun Damage; the character resists the Power, and if there's any left over, they're unconscious for (Remainder x 4 ) x 1d6 minutes for laes, and (Remainder) x 1d6 minutes for leal. YMMV.