You have to press power attack when you don't have full health then it shows...
Therefore if you do it directly after your four attacks it will give you a total time to regen,
This is the information we have, we don't have a normal time to recharge from someone with no faction bonus
So my player with just faction bonus at 14% takes 1hour 25 mins
Then a member with 14% faction and the 20% bridge jumper take 1 hour 4 mins
Then myself with 14% faction and 20% Bridge Jumper and 20% Armoured Tomact takes 54 mins
Does anyone have a completely standard time to recharge? this is a very simple way to see if these bonuses are working