Ancient Magic Spells.

[Jinrya-Geki]

Where are you getting the 45 second cast time from?

When you cast the spell it takes 10 seconds to cast. When you cast it, a buff will appear on you showing 45 seconds. So when counter gets down to zero it may go, or you wasted 100 mp cause it doesn't go off sometimes. So the cast time ranges to about 45 seconds.