I never knew how hard babies could cry

I swear this lady next to me (I babysit) has one of the most sensitive children. She is literally 6 months old, and she cries non stop! I never knew it was possible to cry for a hole hour non stop, but I guess I’m wrong. Today I have to watch these 2 kids, a 6 month old and a 3 year old, and my babysitting job (2 girls, 5 and 7)