Instead of reducing the amount of time that construction takes (which is very variable depending on the worker cards used), each Time Crystal token will provide 10K PP towards a construction project. In phase 1.5 the only available construction project will be clearing the land. Clearing a Common rarity natural land plot will take 1.5M PP in total, so 150 Time Crystal tokens may be spent to complete it immediately. No worker cards, staked DEC, or Grain will be needed if Time Crystals are used to complete the construction.
Time Crystals will be tradeable/transferrable tokens that players can buy and sell on third party markets such as Hive Engine. Time Crystals will also be available to purchase at any time from the local Castle by burning 100 DEC or DEC-B per token. The name Time Crystals, like most everything else, is subject to change.