The only real guarantee I suppose if that is an ad break that starts and/or finishes bang on 9:25am. Beyond that, well the schedule marker that dates from 1983 is buried.
Yes this ad break will need to remain within a fixed window of time centred around 9:20am as there is still a (seamless) transmission switchover around that time. Discussions of its demise are premature.
I work in telly, I sometimes get time to watch telly. More of a technology geek than a presentation geek!