There is little point to rebuilding an index with only 368 pages. The general consensus is not to bother with indexes that have under 1,000 pages.
As for why an index with 368 pages takes over 10 hours to run...that is a bad sign. Just to confirm, are you sure the logs are being written correctly and that the 632 minutes are being attributed to the correct rebuild operation?
There are no special teachers of virtue, because virtue is taught by the whole community.
--Plato