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Armor sets: Recovery Convergence how does it work?

Doesn't seem like there's a cool down, other than the innate 20s synergy cooldown
So if you can get 100k overhealing in/around 20s then that'd be the best uptime but I would think that much might take longer?
Depends if it counts 100k per individual target or cumulatively for the whole group ?
Does someone know more by any chance?