In most cases, meetings are too long and not effective enough. Most successful people either avoid them or try to make them as effective as possible, spending a minimum amount of time on them.
Always require a clear agenda and purpose for the meeting.
Consider doing only short, five- to ten-minute meetings (like Richard Branson).
Consider doing walking meetings (like Steve Jobs).
Have stand-up meetings (they are shorter and equally as effective).
No smartphones should be allowed during meetings.
Before going, always ask yourself if you really need to attend the meeting.