How long does it take to build a road? A moment's reflection tells you that, in a certain sense, this is a pretty nonsensical question: it depends on the type of road you want to build and how far you want to go (it also depends on the weather, the terrain and labour negotiations). It's pretty much the same for e-learning. But that doesn't mean you can't come up with some sort of idea - otherwise we could never plan road construction projects. It's just a lot more complex than might first be assumed. This article surveys found major ways of calculating the time required: comparisons with similar projects, using formulas, bottom-up planning, and industry standards.
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