Witching hour?!!

My son is 5 weeks today. For the last week his early evening feedings last 2-3 hours (into the last feeding of the night). He basically goes nuts wanting milk. I usually start off with BF for 20 min then he starts screaming (my let mill slows down) then give him 3-4 oz bottles, then he wants more, and more, and more, and ends up being 7-8oz total over 2-3 hours. Is that normal? FTM here. I’m starting to get the hang of it, it’s just hard to see him scream like that going nuts every night for several hours. Would love to hear others opinions.