Before rehearsing, to avoid discovering the time problem live.
I have a [N]-slide deck for a [duration] talk. Allocate time per section, flag where I am likely to run long, and suggest where to cut if I am behind. Build in Q&A buffer.
Anything in square brackets is meant to be replaced. The builder turns those into fields you can type into.
Tired of re-pasting the same context into every new chat? That is what the Unimatrix MCP server is for.