I'm not sure if this is accurate, as this post from Captain Powerhouse indicates it is Mag 4 for 13.6 seconds.
Mag 4 is the same as other sets (once the Beta fix for Willpower's aura comes live). The duration may be slightly different (planner lists some of them as 17 seconds), but the tick rate on any of them should make that irrelevant? Most tick at 1 second intervals. SR is 0.5 in the planner (unsure of accuracy on this), but even at 1s, over 13 seconds of duration should make them all similar, right?
edit: Doh! Missed Uun had already covered this earlier.