Humans don't do well concentrating on something for more than about an hour. So fifty minutes seems like a reasonable rule of thumb.
You can improve this if you make it more varied, adding interactions, changing media, multiple speakers taking turns, that sort of thing, but having a rule of thumb helps.
And it fits calendars nicely, fifty minutes per talk, ten minutes break between, one talk per hour.
You can improve this if you make it more varied, adding interactions, changing media, multiple speakers taking turns, that sort of thing, but having a rule of thumb helps.
And it fits calendars nicely, fifty minutes per talk, ten minutes break between, one talk per hour.