It would be nice if there were a placeholder for training email templates that would show the user how long in duration the training modules are. When multiple modules are assigned, a sum of durations would be key. I see the duration posted in the ModStore so you seem to have the data.
When I put users into training campaigns that include more than 1 module I feel like they are afraid that it's going to take forever and end up procrastinating. If we could give them an estimated duration, they would be able to plan their time better around the modules the have due.
My user-bases's first experience with KnowBe4 was the 30 minute long Security Awareness module and they seem to think each one takes forever.