Interview Mark Levin with an engineer who was on board:
http://www.marklevinshow.com/article.asp?id=1790422
Riser mud was being displaced with seawater (typical pre-completion, pre-temp ab'dm't T/A procedure); Halliburton was rigged down and gone for 20 hours, cement presumably cured in that time.
Everything, and I DO mean everything “James” said in that interview tends, at least to my mind, confirm my earlier stated theory. Especially in light of the operations taking place after the liner testing.