Hey,
I've been flying from JFK to SFO a lot recently (yes, all UA flights are now at Terminal 7).
The problem: sometimes I'm there and the place is empty and other times it's packed.
Reason: all the international flights are at different times and it's just luck if you have hardly anyone there or a mass gathering.
Personally my longest wait is only about 30mins. Shortest was like 5mins.
BUT the stupid UA checkin counter line sometimes took about 25min+! And that was in the 1K/Premier Exec line! In fact, sometimes it's faster to just go to the economy lines around back...
good luck.
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new 1K'er
(qualified in 2001)