Institute a rested exp system where you accumulate an exp bonus over the course of the week for hours spent offline. This allows both the player that logs on for 2 hours a night and the weekend warrior that can only login on weekends to keep up with the rest.
Players who utilize their rested exp bonus while online will still level slower than players on food stamps grinding 16 hours a day. However, the players with limited time will at least feel like they making steady progress towards their goal.
Side note: Melees grinding on lightblue mobs solo with bandaids is fucking depressing. I am sure forcing prisoners to solo a melee was proposed as a method of torture in Gitmo, but water boarding was found to be more humane.
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