Well, they’ve always held the Sunday speaker to be the only ‘public’ meeting, the Watchtower study isn’t considered part of that ‘public’ meeting. Wouldn’t surprise me if they started adding a 15 minute break to allow “others” to leave and make the Watchtower study private and combine it with the “service meeting”.
Having an hour long Watchtower study on a simplistic topic question and read the answer has always been very boring and drawn out and simplifying the language last decade hasn’t helped.
A 30/15 break/30/15 minute meeting schedule would still be shorter than the 2+ hours we grew up with, then followed by an almost mandatory Saturday or Sunday “going out in service at least 60 minutes after the service meeting” isn’t outside the realm of possibilities - all your minimum responsibilities as a JW fall into a 4 hour slot every Saturday or Sunday morning/afternoon/evening which is on par with many other churches in the US (you typically don’t go out in service, but many do events/outreach/charity after church).
That schedule can cram up to 8 congregations per building with no heating costs every day of the week, forbid the elders from using the hall for their own damned meetings, as they already told them to pull back critical documents from the building and minimize the library, there is literally no reason except perhaps a CO visit or pioneer school to use the hall during the week.