There were long lines when the iPhone 4 went on sale at 7 am on Thursday, June 24th
The line wasn’t as long by the time I returned to get a phone around 3 pm that afternoon, but I was warned the wait could be five hours
It turned out to be about three hours (which still was long enough that some people left the line even though they had reserved a phone).
Photos from the early line Tues & Wednesday
Some of the photos on Demotix