Between 5.30 and 8.30, CO have 40 departures between 5.30 and 7.00 and 55 at 7.00 til 8.30
95 flights in 180 mins.
1 per 1 min 53 seconds
This is including 8 codeshare flights, but excludes the other airlines, and since CO controls only 56% if seats out of EWR, how obviously inevitable are these delays.
The minimum seperation between takeoffs has to be close to 2 min.
They would have to use the two full length runways to get out of these jams.
By the way, there are also 70 arrivals in the period.