The longest I had was a full 2 weeks of 24/7 crying. I really thought I was going to loose it and had a few tears myself after work. I also went through a few bottles of wine those 2 weeks lol....and I'm not really a drinker!

Quick drop offs, placing him in his playpen with his comfort items, continuing routine, small amounts of time with him on my lap seemed to help.

Good luck!