From the release notes:
This adjustment is incredibly poor, as you have proven you are able to modify xp values on challenges without taking the servers down, please fix this now.The XP on some challenges has been adjusted to provide a more reasonable amount of XP/minute.
1k per minute is what we were aiming for in 2009, times have changed since then and it's a poor goal for many players, yet some challenges can't even provide 1k/min without pots / voice / ship buffs.
6star level 25 Buying time = base 4800xp awarded + modifiers.
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