Quiz Rush Treasure Chest

After finishing at level 100 where the treasure chest was unlocked, leaving it idle for about 8 hours yielded 2 items, and after another 8 hours, almost 2 more were added, making it 4. It takes 4 hours per item, so reaching the max will take 32 hours, over a full day. This is way too slow, so there must be a bug, right...? They wouldn't leave it like this even after fixing the bug, would they? (ー_ー;)