I requested a full withdrawal of my TSP account on 6 June, mailing in my "properly prepared' and "notarized" TSP form 70. This past Friday (14 June) I logged into my TSP account went to the "Messages from TSP" area and found a message that stated my request for full withdrawal had been received and my first monthly withdrawal (via EFT) would be deposited in my bank account on 17 June.
So for me, the answer to your question is 11 days. However, I can't stress enough that the TSP form 70 must be properly prepared, signed, dated and notarized. Otherwise it will be rejected and you will have to start all over again. If that happens, you can check the messages from TSP as stated above.
Hope this helps to answer your question.
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