Comment by AnotherGoodName

This is also fast becoming the norm in many big tech companies. The internal calendar tools will pretty much always start meetings 5minutes after the hour/half hour by default and end exactly on the hour/half hour by default (you can override if needed).

It's pretty obvious, you can't travel to a meeting instantly and 100% appreciated when you work in such a place. For those senior enough for all day back to back meetings you get toilet breaks!

If you work in a company that doesn't do this take note and if you're senior in a company you should start pushing for this to be implemented. A lot of calendar tools have options for meeting buffers by default and enabling it is all you need to do.