it's not one "of the busiest airport in the country". I can confirm that it's malebolge, the VIII circle of hell.
I had my share of trips in my life: european countries, uae, Japan...
But I never experienced anything remotely comparable.
All the times I went there the flights were 3-4 hours late.
One time I was in a plane that was taxing through the Airport for one hour just to wait for a free line to depart.
The lines at the immigrations entrance started from the plane itself!
And there was one time where, after waiting for the gate to open, already a couple hours late, the captain said that someone stole the airplane!!