(If you didn’t suffer through an unproductive meeting, short or long, then this trigger question is not for you. You may stop reading. But I’m sure everyone else would like to ask you a different question: Which planet are you based on?)
Meetings, meetings, bl... boring meetings. Are you also tired of unproductive meetings?
If you are, then it probably is your fault. Not the being tired bit. The unproductive bit.
Were you invited to attend the meeting? Then you had the power to make the meeting more productive. What if you were told to attend the meeting? Well, you still had the power to make the meeting more productive.