Bryan Chapman with Brandon Hall Research has an interesting blog post where he lists the timing it takes to create all types of learning, including instructor led training (ILT) and eLearning. For instance, Chapman's research states that it takes 82 hours to produce a single hour of ILT if the training contains "complex subject matter." He also says it can take 267 hours for 1 hour of eLearning if the "eLearning output contains advanced and custom interactions, embedded simulation activities and lots of media."
Interesting stuff and you can read the full post here.