In my experience this really depends on the quality of writer, most people are not natural writers so tend to spend quite a bit of time on their essays and the subsequent revisions especially if they have a reviewer. For a good writer, usually I see about 3 cuts at the essays with revisions at each stage. For those unnatural writers probably closer to 5 attempts with the earlier cuts taking longer. Usually a few hours at each stage so your estimate does not feel to far off
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It is doable to get the apps in 2 weeks for 1 school, esp if you have done them before - you will have a lot of that same content. However, recommendation letters may be the weak point and if you have not done an app before, it will be a rush to complete everything with a few surprises.
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