Prayer of Healing has a base cast time T of 2.5 seconds. The casts need to end while you still have the Spirit Shell buff, so for that reason I will account for half a second leeway and suggest that we should aim to fit our casts into 14.5 seconds. By default this means we can fit 14.5/2.5 = 5.8 casts of PoH, or just sort of 6 casts.

Haste affects this multiplicatively: If we have a given haste H, we will be able to perform

**5.8*(1+H)**casts. The haste breakpoints will therefore be computed as follows:

Start with a target number of PoHs, say 7. Divide it by 5.8. This will be 1+H. So for instance for 7 PoHs we need to reach 7/5.8 = 1.2069, or 20.69% haste.

Here's a table of it all. Again, this assumes that we fit our casts in 14.5 seconds, leaving us with 0.5 seconds to account for latency etc for the buff to drop off. This is how much haste you will need in your character sheet to be able to cast that many PoHs. The two worth possibly reaching I think are the 9.47% that allows you 8 PoHs (4 on each group on a 10man) under Power Infusion, so on every second Spirit Shell, and 14.94%, which allows you a 7th PoH always. You can always fit at least 6 PoHs with the 5% raid buff.

Code: Select All

Buffs 6th PoH 7th PoH 8th PoH
-------- ------------ ------------- --------------
No buffs 3.45% (1466) 20.69% (8793) 37.93% (16121)
5% Raid - 14.94% (6351) 31.36% (13329)
5% Raid+PI - - 9.47% (4024)

If we want to account for a bit longer latency, and try to fit our casts into 14 seconds, the breakpoints would be the following:

Code: Select All

Buffs 6th PoH 7th PoH 8th PoH
-------- -------------- -------------- -------------
No buffs 7.14% (3036) 25.00% (10625) 42.86% (18214)
5% Raid 2.04% (867) 19.05% (8095) 36.06% (15323)
5% Raid+PI - - 13.38% (5685)

You should of course treat these numbers as rough estimates, but they can help as a guide on what haste amounts to aim for.