The remaining time is indicated by a cake shaped icon on the screens where you stay a while. (i.e. not on each and all screens needed to enter contract, lead and result).
When less than 5 minutes remains the cake will be replaced by a timer counting down minutes and seconds. 
When the round time has expired any overtime will be indicated by an upwards counting timer. Overtime is shown with exclamation marks.
There might also be sound signals at various stages depending on the settings in the control software.
You can anytime click on the cake/timer to display the timer details:
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