Short answer
You should see early changes in how managers behave within about 90 days, if the program includes spaced practice on real work and you measure before and after. Changes in operating results, like fewer escalations or faster handoffs, follow as those behaviors take hold. If a program only measures satisfaction at the end of the session, you won’t know whether it worked at all.
The longer answer
To measure success, decide what you’ll measure before the program starts. Use the same instrument at the start and the end. Measure behavior, like how often managers give feedback or settle a decision at their level, not just how people felt about the course. And tie at least one measure to an operating number your COO cares about.
That’s how our 90-Day Change Sprint is set up: measured at day one and day 90 on the same instrument.