Serial Re-delegation, or is sometimes referred to as validator hopping, is discouraged. This means when one re-delegates from Validator X to Validator Y and immediately re-delegate from Validator Y to Validator Z, the action is blocked temporarily. The immediate Re-delegation from Validator Y to Validator Z, or to any other validators, is subject to a 21-day holding period. After this "cooling off" period, one can re-delegate to another validator and the same goes on where one cannot Re-delegate again until after 21 days later.