I think motivation Speech was changed to a buff again, to allow it to target players outside of your group.
With this change, you basically just need 1 Captain to buff the raid, before only the players in your group received the buff.
I mean you could increase the duration by a bit, but if you make it too long like 30+min, it could be "exploited"
you could simply buff your raid group and then invite another class that replaces the captain. With a somewhat short duration, you are "forced" to have an actual captain in your raid.
But increasing it to 10-15min should not hurt much, imo.
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