I am not sure how long it usually takes for auctions to automatically repost but I have a lot that finished over 2 hours ago that are still in the 'Auction Closed' state. They all still have 1 or more reposts to go. eg: 68935480.
Edit: Still stuck, the last auto repost was 3 hours ago. Is anyone else having this problem or is it just my listings?
Update: OK now, all the reposts have kicked in apart from 3 which I had to edit to get going again.