You should set SQL_TRACE = TRUE and TIMED_STATISTICS=TRUE in your session before creating your table. Create your table and then do a tkprof on the trace file.

Of course when you create a table from a query the amount of time it takes is dependent on the amount of data you are tying to put into the table. You could easily create the table first, preallocate the space and then do the insert based on a query.