Loooong, especially for one of Clancy's earlier books. It took a while to get started and was much more involved than the audiobook. Took quite a while to get through.
That's the capsule summary from 2002(?). I remember reading a used paperback. The parts that I'd previously listened to were quick reading, but the technical details were a lot of slogging. Everything other than the stuff in Iceland seemed to induce sleep.
Overall, though, I did enjoy it, but not as much as some of Clancy's other early stuff.