Currently, for Iron and Lapis, they get 1 regular cubelet each week. Gold, Diamond, and Emerald get 1 super cubelet every two weeks. For Obsidian, they get 1 uber cubelet every month.
I suggest lowering the amount of time you have to wait before reclaiming the reward. I suggest that it should be 1 cubelet every 3 days for Lapis and Iron, 1 super cubelet a week for Gold, Diamond, and Emerald, and 1 Uber cubelet every 2 weeks for Obsidian. As cubelets are just for cosmetics, this change will not affect gameplay in any way.
To sum up what little is above this, half the time for the ranks cubelet bonuses.
I suggest lowering the amount of time you have to wait before reclaiming the reward. I suggest that it should be 1 cubelet every 3 days for Lapis and Iron, 1 super cubelet a week for Gold, Diamond, and Emerald, and 1 Uber cubelet every 2 weeks for Obsidian. As cubelets are just for cosmetics, this change will not affect gameplay in any way.
To sum up what little is above this, half the time for the ranks cubelet bonuses.