I guess you're asking me to compare. I would say that the present contracts may not be exactly the same as previous contracts. This one is different particularly because there are no IRBs, as there were previously in contracts. However, the timeframes you are mentioning seem to be the norm.
Evidence of meeting #26 for National Defence in the 40th Parliament, 3rd Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was aircraft.
A recording is available from Parliament.