No idea I'm afraid. We were lucky to be at the front of the queue off BA177 last month, I expect those behind us were 90mins at least.

The Global Entry kiosks were working when we went through, although the regular kiosks were not.

GE is a slight time faff to get, but's cheap for five years of much easier access to the US. Cost me about £100.

(I didn't use GE in Aug, because I had the family in tow).