That isn't the case for everyone everytime. I've fought it before with everyone spamming debuffs and it hadn't even used the first exuviation by 2 minutes. Not even sure if we were done removing dt by 7. You say 15 min easy but definitely spent 25 minutes in fracture before it 1 shotted me on pld and the procede to slowly rape the dds it hadn't already then mages. And it was still at 15%. Now granted someone did throw up a debuff mid fight and it got off a 14k exuviation but still not as easy as you say
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