A quarter is a beautiful thing.
I often talk in initiatives (=group of projects with central impact on the business) which then get broken into quarterly focuses. Not everything needs to happen all at once. It’s easy to try to accomplish a lot in just a month which leads to less progress and more frustration. If your managers have one central project per quarter that gives them the focus needed to make tangible progress, while still doing their daily responsibilities. A month is often not enough time but a quarter can be.
A quarter can create urgency on the project while also acknowledging the time needed for daily responsibilities. Sometimes going ‘slower’ can mean going faster.