Six months is a good practice, because it's seen not only as fully sufficient to provide accurate public accounts, but also to be meaningfully within a period of time when, if there's a need to course correct, it is still possible. When you have public accounts that are tabled in November or December, the fiscal year is already two-thirds of the way over, so, if you as parliamentarians see that there's a major issue with an area of spending—which has not been the case in Canada, but should that ever be the case—it's very likely too late to make any corrections to that wrong trajectory.
On December 1st, 2022. See this statement in context.