In order to give DAO participants enough time to stake, vote, check and discuss proposals, each of these periods lasts for 4 days: Warm-up, Voting, Queued for execution, Grace.
Notice, the Queue period is the only state that requires a user action to activate.
When it is activated, its 4 day lasting period counts from the moment when the voting ended, not when the user did the action. For example, if voting ends and someone queues the proposal 2 days after, it will not stay in the queue for 4 more days but only 2 days because 2 have already passed.
After being created, the proposal enters the Warm-up state to allow people to stake their $XYZ.