I’ve flown out of Newark 4 times this year, terminals a, c and b twice. Never been on line at security for more than 45 minutes. With all that being said if you’re at EWR 3 hours early for an international flight you’ll be sitting for awhile. 1.5 you could be cutting it close if it’s a heavy travel day or you’re at the airport at peak times. I’d arrive sometime between the 1.5 to 3 hours early depending on what time your flight takes off. If it’s an early morning flight though you can arrive an hour before and you’ll be fine.