The second part of the process would be building the course. This part would take the most time and take the most discipline. It can take some time to gather all of the information, resources, assignments, and media. This task could take a while if all of the things are not already in one location. Having to go out and find all of the resources for my course can take some time. I know what I want each module to do but I do not know where the material is located. I am trying to use already created resources but I might have to make some. That is the issue that I can see in hitting the 3-week deadline. When designing a course like this, it is important to get some feedback from other so you would need to be done with building the course in time to get a review or two. Time would also need to be there to make changes based on the feedback that you have done.
The corporate timeline is one that can be done but would really take some focus to get all of the parts done with enough time to properly create it. But if this was your job, and you spent your work days creating, this can be done. It would be interesting to try to keep up with that timeline and see if that was something that could be followed.