As others answered already the other questions... be aware HQ gear binds faster than NQ gear and materia also makes the binds faster.
i70 gear fastest bind with Binding Coil of Bahamut Turn 4 you can make around 25% with 1 run in HQ gear and materia melded. Also binds pretty fast in Labyrinth of the Ancients, Ak, WP... well generally the lower ilvl dungeons.
i90 gear you bind accordingly with Second Coil... i think Turn 6/ Turn7 trashpulls are fastest here. Alternatively here Syrcus Tower and the recent Expert dungeons i guess.

Gear at around i55 bound fastest so far in Aurum Vale btw