Would you like an in-game parser?

[JunseiKei]

Titan's heart phase was an insta wipe if failed. Tumult did a craptastic amount of damage if not mitigated, landslide was permadeath, and losing a healer to that was an immediate wipe. You could in theory make the final phase run as long as the instance clock allows assuming that everyone can dodge all the bombs and mitigate the tumults and avoid the landslides, etc... Of course Titan has been 'eased' many times, since then. But yeah, the heart phase was a pretty hard 'enrage'.

Hence why I said adds and stuff; heart phase could be considered an add for intents and purposes. If you took care of the instant wipe mechanics and just moved, halting all DPS, the fight would go on until the timer ran out. Not like later primal fights where you have this many of the primal's rotation or this much time until it hard enrages and we all die~ ♥

EDIT:

Titan HM has a soft enrage, not a hard, last I checked. If you don't down him in a certain time, then he'll start doing more and more tumults up until you kill him or wipe. I remember one time way back in early 2.x being the only dps alive from the heart phase on as a mnk with a pld and a whm. When we finally wiped, Titan was doing 12 tumults(stomps).

Ah, good to know. Something that would have killed when it was relevant, but something you can easily power through nowadays.