How long will you wait in the TSA security line?

(CNN)I'm flying out of the busiest passenger airport in the world on Friday morning, and I don't know how early to get there for my flight.

You'd think a travel writer would know.
But I've seen the same tweets as everyone else about long, long security lines at airports all over the country, interspersed with tweets about short lines at the same airports.
Which lines will you and I face?