code: public function getMinimumRemainingTime()
      {
          if (($timeLimits = $this->getSource()->getTimeLimits()) !== null && ($minTime = $timeLimits->getMinTime()) !== null) {
              return $this->getRemainingTimeFrom($minTime);
          }
          return false;
      }
docs: Get the time remaining the candidate has to spend by the candidate on the source of the time
  constraint. Please note that this method will never return negative durations.
  
  @return Duration A Duration object or null if there is no minTime constraint running for the source of the time constraint.