On my DS II (same jib, theoretically) the bottom hank is about 18" or so up from the tack, the top hank is about 6" or so down from the head, and there are a total of 6 hanks (roughly equally spaced). The standard DS jib has a 15' luff, so the hanks will be about 2.5' apart (seems wide spacing, but I'm estimating from memory and a picture of my boat) I'd check my jib but it is stored at our cottage 40 miles from my home (as is the boat). I used to keep my sails in my home attic for the winter..... too bad I stopped doing that!
I've included a close-up of the jib from the picture that I made my estimates with, too bad you can't see the top hank.... well, it should still help! I also included the whole pic, do I look relaxed? Maybe I'm trying to ignore the powerboater (my Dad) trying to take the picture?