General question: estimated dev time

For example:
Lets say that I have a folder hierarchy that contains ~6K files of mixed types. I need to locate every .png file, convert them to a .psd file ( I know scripting Adobe PS is rare. for the question you could assume tiff ) replicate the folder structure of the png original file inside a new top level folder on the desktop, and copy the psd ( tiff, whatever ) into the newly created folder structure that matches it’s original’s previous folder hierarchy. Produce a listing at the end of the original PNG file paths and the new PSD file paths.

I’m not looking for coded solution here, this is just an example task.

I’m curious how long you would estimate this task would take you to code up in your AppleScript environment. Utilizing your existing code, libraries, apps, etc., that make solving this more efficient. I have to roll up a solution of complexity similar to this pretty frequently and I’m curious how long these one-off scripted solutions take others to build, test, and debug to a high confidence level; while these are used in a commercial process they are internal functionality-gap-spanning, not distributed tools.