When to use limit break?

[Mykll]

You can still use the LB towards the end. Just do it, for example, with 10% health left, instead of 1%.

Something else, especially in 4 man parties, you could use the LB right at the start of the fight, and potentially have it build up again by the end of the fight. Get 2 LBs in overall instead of just 1.

I think in all cases regardless of party size, if the LB bar is 2 or 3 bars long (in total, not necessarily currently filled) the LB bars will empty at the start of the last boss fight. Someone will correct me if I am wrong on that. Once you run some dungeons and know them really well you will see. Saving all that LB for the final boss is a waste, unless you get fancy by doing a ranged DPS LB pull on the boss, or the second tank LB right before the MT tank pulls (there is an animation lock, so if the MT LBs and then pulls, it's largely wasted) to give him a shield. Because, after all, the LB bars will empty upon boss agro.

Anyroad, glad you are having a blast!