To create a stage with simultaneous concordance among several users, do the following:

1. In IWorkflowActionProvider, register a action to check condition.
2. Add Timer "WaitTimer".
   
3. Add a cyclical Transition to the current Activity with the following parameters: Trigger Type:  Timer, Trigger Timer: WaitTimer, Condition Type: Otherwise.
4. Add an outgoing Transition to a current Activity with the following parameters: Trigger Type:  Auto, Condition Action: Action from p. 1, Condition Result on PreExecution: True.