Quote Originally Posted by Baa View Post
The same one detailed on the first page.
The reasoning for 2.40s GCD is to make sure HT doesn't drop, letting it buff the next HT:
HT(2.4s used up here) --> 9 other GCDs using up remaining 21.6s of buff --> HT again on the dot

But HT applies ~1s into its own GCD:
HT(~1.4s used up here) --> 9 other GCDs using up 21.6s of buff --> ~1s leeway to HT again
2.4s isn't needed to have HT buff itself because of animation/debuff/buff delay and how attacks snapshot on the start of the attack, though when you are over 2.40 there is a slight delay where HT will drop and any oGCD's or autoattacks in that brief period may not have the HT buff - I'm not sure this is really worth getting the SS as well. For people with bad ping the extra SS helps maintain the HT buffed HT when double weaving or if jumps eat into your GCD.