Drow Poison affliction duration

[Archaeik]

I'm not sure this is exactly a rules question, but maybe I misunderstand how the mechanics work?

Drow poison wrote:

Injury 13 — 1/min. for 2 min. Unconscious 1 min./2d4 hrs. 1 save 75 gp

Maybe, I'm assuming too much to think that it's actually based on the 3.5 poison of the same name which only ever required a single additional save vs the secondary effect, but as I read it in PFRPG:

Injured with Drow Poison, failed save = unconscious 1min
1 min later, failed save = +2d4 hours unconscious
1 min later, failed save = +2d4 hours unconscious

Just curious if this is an intentional buff, unless the unconscious durations are supposed to overlap instead of stack?

[wraithstrike]

They seem to overlap not that 1 minute matters if you are sleeping for hours.

[Archaeik]

The initial minute duration is always over before the first secondary effect unless you have one of those specialty poisoner builds.

The question is more about legacy congruency.