I sell a software product, which collects data from websites. My customers do the configuration of the product themselves, and it can, for the most part, generate the XPath Expressions automatically.
Some sites are more complex though, and the product cannot determine the correct expressions automatically. The user's will the submit the site in a tool with links, and it's your job to create an XPath Expression and add it to the tool, which notifies the user that an expression has been created.
The tool will notify you with an email once per day, of any new assignments to be completed. I would estimate this job is everywhere between 0-3 hours per week.