I researched on the news archive of Tibia.com and I found this answer from Burchan that indicates how that affects to the respwns on active area.
How will those changes affect future Rapid Respawn events?Due to the permanent decrease of the respawn time, monsters will now spawn five times faster during Rapid Respawn events in the future (instead of ten times), respectively seven times faster in areas with an active respawn bonus.
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