I got a single for a mate on his ST in the 3pm sale. Had a queue, took a while to refresh with the numbers on the queue, then said 1 minute wait when it did.
Not sure exact time i got in, was concentrating on buying. I just did choose seat for me. Email confirmation is 15:04.
Prior to the sale, about 1430, there was one block on the end (the thinner one) that was about 80% full. Other blocks just had one or two singles in them