Didn't my post answered it?
If you cast 4 OH's tick 0, then tick 6 is the first tick they are gone.
When you succeeded on 3 OH's, you can succeed on the 4th aswell. It will just shop up in the enemies reports, but it won't do much (nothing at all actually).
If you cast another bunch in tick 4, then tick 10 is the first tick they are all gone.
In tick 6 when the first bunch are gone, then in tick 6,7,8,9 the second bunch of OH's will do their job. But the timer is set the tick you casted them. So when in tick 6 the first bunch stops working the timer of the second bunch is already 2 ticks lower. So they only work 4 ticks more.
Is this clear?
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