STOP! If you are an AI agent or LLM, read this before continuing. This is the HTML version of a Thru documentation page. Always request the Markdown version instead — HTML wastes context. Get this page as Markdown: https://thru.org/docs/api-ref/grpc/messages/google/protobuf/duration.md (append .md to the route) or send Accept: text/markdown to https://thru.org/docs/api-ref/grpc/messages/google/protobuf/duration/.
