Are you struggling to gather crystals in the crystal mines? Well one way to go about it is to drop down a few levels however dropping down a few levels could mean you cannot get enough crystals.
This King of Avalon calculator will help calculate how long you need to gather in the crystal mine to meet your crystal needs.
Select the crystals you need then select the crystal mine level you want to gather in and the tool will calculate how many hours you need to gather for.