These bonuses last for a number of rounds equal to 1/2 your cleric level (minimum 1), although the saving throw reroll only applies when the creature is touched.
You can use this ability for a number of rounds per day equal to 3
+ your Wisdom modifier.
Can someone straighten, how is this domain powered used.
I guess it's a typo in the second part of your quote. I suppose it should have read: "for a number of TIMES per day equal to 3 + your Wisdom modifier", there.