British & Australian, informal if someone is talking nineteen to the dozen, they are talking very fast, without stopping.
Gaby was chatting away nineteen to the dozen behind me and I couldn't concentrate.
ten to the dozen
Very rapidly, hurriedly, and/or energetically. My aunt can get talking ten to the dozen if you get her on a topic she's passionate about.Samson came running ten to the dozen when he heard his son crying out to him from the back garden.