If your schedule your meeting for one hour, and then your meeting lasts exactly one hour, you have failed.

If you schedule an hour for a meeting, and your meeting lasts for an hour, you have failed, for three reasons:

1. The efficient person attempts to complete tasks in less than the allotted time. If you’ve given yourself 60 minutes to complete a task and require all 60 minutes to do so, you have not been efficient.  
    
2. Meetings that end early are always perceived more positively than those that end on time or later. Ending your meeting on time eliminates this simple means of improving the perception of every meeting that you conduct.  
    
3. What are the odds that you have precisely 60 minutes of content to cover in your meeting?Not likely.

This means that you are either filling time because you are a rule-following completist who oddly believes that an hour scheduled must equal an hour filled, or you have scheduled too much content for your meeting and have either failed to complete your agenda (which is always frustrating to attendees) or are rushing through items that deserve greater attention. 

Not good either way. 

Here is the correct mindset for every meeting that you plan: