Adjust PvP EXP/Marks based on battle duration

[Alhanelem]

A longer battle should yield more EXP/PvP EXP/Marks. Currently you get the same amount of EXP whether the battle lasts 30 seconds or 10 minutes, meaning the shorter the battle is the more EXP you're getting. To compensate for this, up to a certain limit (say 10 minutes) the rewards should gradually increase. It should be a minor increase only to keep the exp / marks consistent.

Example: You have a battle that lasts 4 minutes (including the 2 minute wait), and you get 30 pvp EXP. you have a battle that lasts 10 minutes, you get 40. It would still be better to play two short matches, it just softens the blow.

This is NOT bonus EXP- its an adjustment to reduce the disadvantage of drawn-out battles.