OS Unix HP 11.00

Hey Oracle peeps;

I am in the process of rebuilding one index on a table that has about 50 million records. The index is a primary key and only has one column assigned to it. I have created a seperate tablespace for the index but when I look at longops in DBA Studio it is telling me that it will be another 9 1/2 hours!!??

Any reccomendations? I have allocated extra space in the temp tablespace but this is just dripping slow.