It depends on the specific proposal, and on the number of demands placed on my office. If it's something very simple that seeks to amend a tax rate, for example, without any other changes to any other tax parameter, it's fairly simple.
If it's an entirely new program that has not been implemented anywhere in a jurisdiction in Canada or in a similar jurisdiction, this would be more complex. We could be talking weeks. If it's fairly simple, we can be talking a matter of several days. Of course, the more details I get from the requesting party, the easier it is for me and my office to determine the cost.