R-20, r. 12 - Rules of procedure and practice of the construction industry commissioner

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38. The party that requires the summoning of a witness shall complete the subpoena.
The party must serve the subpoena issued by a commissioner at least 5 clear days before the hearing or, for a subpoena to a minister or deputy minister of the Government, at least 10 clear days before the hearing.
If the matter is urgent, a commissioner may reduce the time for service of a subpoena; it may not, however, be less than 12 hours. The commissioner shall indicate that such is the case on the subpoena.
O.C. 850-2002, s. 38.