Calculating Frostbolt cast timers?

how do I calculate frostbolt cast timers?

I guess its 2.0/1.45 if you have 45% haste,

?

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Haste increases cast speed, but it does not mean that this value is substracted from original cast.
The formula is - base cast speed / new cast speed * base cast time.
For example, with 25% Haste, you have (1 / 1.25) * 2 seconds of base cast time = 1.6 sec cast time for Frostbolt.
The same applies to other cast times excluding Arcanosphere and even some CDs like Fire Blast.
Hope it helps!

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This is correct: cast time/(1+haste) = new cast time

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Thank you, I forget maths, how the hell do I figure out how much haste I need for a 1.4second cast timer, is there an algebraic way to reverse it ? lmaooo

1.4 cast = 30% reduction, it is achieved with 43% Haste. That is accessible during Icy Veins with 10% base Haste or even less if you take and stack Slick Ice.

Thanks I think ill use chatgpt or google and the formula, Idk how to do it on pen and paper or even with a calculator.

How do I figure this out again as gnome, I want 1.549999 or less, so it doesn’t round up to 1.6. I’m ocd. Any help how much haste% I need to get less than 1.55 cast timer?

1.55 = 22.5% reduction to base cast time
For that you would need 29.1% Haste or more.