Hi Tyson, I moved your question to a better location for more visibility.
Thanks Tiger Wu for moving it in my line of sight
Tyson Creager I see that you asked this question several months ago but in the new LMS that Marketo University Learning Portal is built on it should be marked as complete right away if every slide is viewed.
For me it was immediate but you have to watch it all the way through. Once done, refresh the page and it will be updated.