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 displayed with a pulsating indication in seconds.
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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