6 hours of cluster feeding?!

H 💍👧🏼👶🏼🤰🏼
My baby is 1 month tomorrow. She's been eating almost non stop for the last 6 hours. I'll nurse for like an hour, she'll be happy for 15-30 minutes, cry and act hungry, eat 2-4 ounces of formula, happy for 15-30, nurse... Repeat. Is this normal?!  I'm exhausted!!