Yes, I ran into the same problem a couple of years ago with the local SDK, and again recently when I first deployed my app to appspot.com. The solution that worked for me was to batch upload my data with no more that 60 records in each batch. (Had to write some local tools just to work around this problem!) Otherwise the delays kept expanding exponentially until hours became days and days became weeks -- it would never finish the upload. Hope this helps!
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