Saku Tuominen and Pekka Pohjakallio of 925 Design who work on creating effective workplaces found that scheduling meetings for 45 minutes rather than the standard hour allows time for reflection and down time for preparation for your next meeting or consideration of the previous meeting.
I have found that actually how you schedule those 45 minutes also makes a difference. If you start the meeting at quarter past the hour and finish at the hour, the meeting tends to end on time freeing up that additional 15 minutes. If you start on the hour and try and finish after 45 minutes, the meeting often drags into that extra time with most people assuming that the meeting will finish on the hour.
If you could get back 3 x 15 minutes a day, would that be worth cutting your meetings shorter? Can you achieve as much in 45 minutes as in 60 if you are mindful of the time and keep to it?
It might be worth trying to see if it works for you.