answer: \#Person2# will shorten a pipe for #Person1# by 2 p.m.
documents: #Person1#: Can you shorten this pipe for me? It's too long.
  #Person2#: Sure. I'll do it after lunch. What length do you need?
  #Person1#: Can you take 15 mm of it?
  #Person2#: Yes, no problem. It'll be ready by 2 p. m.