The turn order in Legacy is extremely flexible, regardless of the time scale. The order in which characters resolve their turns is entirely up to the players, and does not need to be predetermined. If one character takes an action that another character, yet to take their turn, can benefit from, the players can cheerfully agree to change the order. However, no character who has already taken a turn is permitted to take another turn, until every other character on both sides has done so.
Once a character begins their turn, they must take all actions within that turn and then declare their turn completed. If they do not use up all six seconds of their turn, they are permitted to abandon extra seconds.
After each player character takes a turn, the Director is permitted to select one of their non-player characters and take a turn. Non-player characters follow the same rules as player characters: once any non-player character has taken a turn, they cannot take another until all other characters on both sides have taken their own turns.
The exception is monsters with the Solo property, who can take a turn after every player character turn.
All turns are treated as being completed when the character taking them finishes their turn. This might not be strictly realistic, but it's easier to play.
When in an encounter, or otherwise in Rounds time-scale, each character may take up to six seconds worth of actions. However, each combat round is ten seconds long. It is assumed that each character performs four seconds' worth of actions, such as surveying the battlefield or completing movement, each round. But this additional time is not modeled, and can be safely ignored.
When in Minute time-scale, the party moves as a whole. This is done before characters are permitted to select actions. The party can move a distance equal to five times the speed of the slowest member of the party, in meters.
When in Hour time-scale, the party can cover a distance equal to the speed of the slowest member of the party, in kilometers. However, long-distance travel is an action by itself, requiring one hour to move that distance, and there is a cost, in recoveries, to taking this action.