Don't worry, we can add this guy into the equation too.

The assclown in the meeting on his laptop is generally operating at between 0 and 50% efficiency; about 25% on Google Chat and 25% in the meeting asking questions that have already been answered. Let's be generous and say 50%, but its probably less.

Now, that's 1.5 hours lost in the meeting plus preparation, but the meeting needs twice as much time to get the same done so that's 2.5 hours now times 8 people per meeting.

It's probably exponential though, since laptop people have to talk to other laptop people in the meeting at only 0.5 efficiency. So its probably more like 0.5 to the power of the number of people on their laptops.