I think ten minutes is an excessive amount for opening comments for individual witnesses, and I'm not sure we've ever given that, though that is what it says here. I will also recognize that there have been witnesses who have taken ten minutes when asked to give a five-minute opening statement, but--
Evidence of meeting #1 for Procedure and House Affairs in the 41st Parliament, 1st session. (The original version is on Parliament’s site, as are the minutes.) The winning word was chair.
A recording is available from Parliament.