Basic turn system:
One round is the length of every party member taking a turn.
One turn is a player action.
A DM will roll to see the order in which the players post. Depending on the situation, the DMs can apply a respective influencing stat modifier (e.g., when socializing in a tavern, charisma will be the influencing stat). An amount will be added or subtracted to the player’s roll based on their respective stats (someone with no charisma at all will be the last to start talking to people, whereas the person with the most charisma will get right out there).
From a metagame perspective, if the next person in order fails to post in, say, 24 hours, their turn will be skipped and the next person in the queue will go. If the skipped person manages to alert the DMs before the round is over, they will go at the end of the queue after everyone else has taken their turn.
And that’s an example of a rule.