I finally got my iPhone X pre-order submitted with my carrier, it took an hour and 10 minutes due to:
- site crashes,
- unable to enter card details as input boxes wouldn't load,
- then messages that the card wasn't an accepted type.
I've seen reports from others of waiting times creeping up from launch day to 3 weeks then 6 weeks while I (and others) have been stuck in the system but I don't actually know how long my wait time is - the email just says "we'll let you know as soon as it's ready."