There is a linear “Time Track” with many spaces. Each player has a marker on the track, which indicates where they are “in time.” Markers farther on the track are further forward in time.
The player with the marker lowest on the track (furthest “back in time”) takes the next action. Each action has a cost in time, and the player’s marker is advanced a number of spaces according to that cost. Then, the next lowest marker on the track takes an action. It is possible that the same player takes multiple turns in a row.