I'm not sure of the exact value, but it should be either 6 or 5 frames per cast. The only changes this brings to this guide (based around stormcall) are:
- When you first get to level 120 a well rolled rare, or a decent crafted sceptre is better than the TU6 Axe.
- For single player endgame gear a sceptre + shield will be better than the staff of shadows.
I will update the changes in the coming days.