Its base 5 secounds plus 1 per arcanist for thunderstorm, so up to 11 secounds with a level 6 arcane focus.

For EoW it is a base 1-5 secounds plus 1 per arcane focus, so up to 6-11 secounds with a level 6 arcane focus.

The crappy part is that it goes against their resisting spells level