I don't get it.
Imagine a spell that has a 30 seconds CAST TIME and 5 seconds COOLDOWN.
You won't ever save up to 30 seconds by memming it in slot 1 - the spell still takes 30 seconds to cast.
But you will save up to 5 seconds by doing so (because 30 > 5, the spell will always succeed as it will never complete before its cooldown is over), as it will allow you to START casting the spell before the cooldown is over.
Therefore, you are saving up to 5 seconds of time, which happens to be the spell's cooldown.
Maybe I'm not seeing something obvious..
Now on short-casting spells, the figures are a bit different but still, at no point you're saving spell's casting time unless it's a coincidence.
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