Originally Posted by
Donjo
Actually, a PLD who goes completely ham without using Shield Swipe once will run out of TP in approximately 2:35 of full uptime(it's easy for this to happen while being an OT), give or take 5 seconds or so. This is faster than melee classes, who all have Invigorate to extend their max full uptime to about 4 minutes or so. Diligently using Shield Swipe will naturally extend uptime, but its benefits are variable since it's linked to Block.
Either way, that sentence was meant to be amusing more than anything else. You're right in that it won't decrease full uptime that much, but Skill Speed still differs from the other Secondary Stats in that being out of TP completely removes its benefit to your damage.