There was a whole thread about this just a few days ago.
It is a known problem that many of us have experienced.
MakerWorld has finally worked out the cause and according to @tanklet, the fix will be sometime next month.
In the meantime, the only solution is patience as has already been mentioned here earlier.
I have experienced around 30 minutes at the outside time.
I gave this tip in the original post to sometimes speed things along.
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