In April 2018 Elon Musk sent an email to Tesla employees with advice on productivity. It began with meetings. “Excessive meetings are the blight of big companies and almost always get worse over time.” He asked them to get rid of large meetings unless they were providing value to the whole audience, “in which case keep them very short.”
“Also get rid of frequent meetings, unless you are dealing with an extremely urgent matter.” And: “Walk out of a meeting or drop off a call as soon as it is obvious you aren’t adding value. It is not rude to leave, it is rude to make someone stay and waste their time.”