It probably took you longer to formulate and write your comment than what it took for the author to add that in the bottom of the README.
I genuinely want to understand if recruiters or hiring managers take time spent on a project into account when looking at candidates. For example if two candidates implemented some sort of basic API, do they look at the candidate who took two hours to implement it more favorably than the one that took 5 or 6 hours? Should people, in general, include time taken somewhere on a project page? Is there a threshold where it’s more hurtful than helpful?