3 hours Friday, 7 hours Sunday, 2 hours Monday.  

No nested comments (although comments have subcomments - I just didn't figure out how to recursively print them out.

No complicated sorting algorithm, yet.  I didn't figure out how to auto-update the score column in the database or otherwise apply a scoring method and then sort the posts outside of the database.  Yet.

It does kind of look like reddit, though.