Players may call a judge before the round clock starts or in between games of a match to request up to a 10 minute time extension in lieu of penalty at the judge’s discretion. (Example: A player requests to use the restroom.)
§ 703.8.e Tournament Rules PDF (officieel)
§ 703 Tournament Errors
§ 703.8 Late to Match: A player arrives at their assigned match after the round clock has started.