Anet has made a post on their forums about upcoming changes to the way we unlock our skyscale mounts.
In summary:
In the May 28 update, we’ll reduce the time between collection tiers from 24 hours to 2 hours, to reflect the passage of a full day in Tyrian time rather than in real world time. You’ll also be able to feed your skyscale four times a day instead of three, reducing the total number of days you need to feed your skyscale by one (assuming you feed them the maximum amount each day).
Read the full forum post here.