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

How long does it take to create learning? | Bryan Chapman