Some learning development estimates from Bryan Chapman.
Ratio Type of learning
34:1 Instructor-Led Training (ILT), including design, lesson plans, handouts, PowerPoint slides, etc.
33:1 PowerPoint to E-Learning Conversion. Not sure why it takes less time then creating ILT, but that’s what we discovered when surveying 200 companies about this practice
220:1 Standard e-learning which includes presentation, audio, some video, test questions, and 20% interactivity
345:1 Time it takes for online learning publishers to design, create, test and package 3rd party courseware
750:1 Simulations from scratch. Creating highly interactive content
Mike Taylor 