Coming from me working at a shop, an hour labor is very fair. Honestly I take longer. Digging out remnants of old elbow, cleaning the corrosion out of the lim and timing cover/old rtv. In a perfect world I'd do it in less but it doesn't always work out like that.
Exactly why I couldn't pay someone else for something I can do. What does a shop care if a chunk of plastic gets left in the lim?