Three to eight weeks sounded short to me, too, Lena, but I only have two sub experiences to go on, plus others I've read about on this forum — and one of mine was in the summer, which is notoriously slow. JL has a much larger sample size. It could also depend on the individual agent's relationships with editors, I'm guessing, and the genre.
Anyway, bon courage on that call! If you do have rejections, be sure to ask if any specific feedback was offered, since it could be helpful going forward. Both my agents forwarded me all the responses, which was occasionally harsh but also useful, and made the process less scary and mysterious, I found. (Even when they are critical, editor Rs are super-polite.)