Well actually it's once every minute'ish...
You have 3 bubble spells (Divine Protection, Blessing of Protection and Divine Shield) all with 5 minute cooldowns but you get a 1 minute idle time when you can't cast another one on yoruself. However, a Protection specc'd Pally will get a 2 minute cooldown reduction for Blessing of Protection and a 1 minute reduction for Divine Shield. Therefore, DS ..... 1min ..... BoP ...... 1min ..... DP ..... 2min ...... DS ..... 1min .... BoP .....1min.....DP .... etc etc
granted you will be OOM well before you get to the 3rd one but it is possible! For group PvP this is a great thing as you can still cast spells while in all of the bubbles, you just can't melee....but 2 pallys can alternate so a 30s window is when each is healing the other and the enemy will have to swap between them causing loads of confusion :)
You have 3 bubble spells (Divine Protection, Blessing of Protection and Divine Shield) all with 5 minute cooldowns but you get a 1 minute idle time when you can't cast another one on yoruself. However, a Protection specc'd Pally will get a 2 minute cooldown reduction for Blessing of Protection and a 1 minute reduction for Divine Shield. Therefore, DS ..... 1min ..... BoP ...... 1min ..... DP ..... 2min ...... DS ..... 1min .... BoP .....1min.....DP .... etc etc
granted you will be OOM well before you get to the 3rd one but it is possible! For group PvP this is a great thing as you can still cast spells while in all of the bubbles, you just can't melee....but 2 pallys can alternate so a 30s window is when each is healing the other and the enemy will have to swap between them causing loads of confusion :)