Gather Stats taking too much time to complete

Having a table, sized around 155GB.

Script is given below to gather stats for the table.. It run more than 2 weeks thn also not completed. Then because of some batch process we forced to stop this scripts.

Need help for tuning the scripts to get better performance...

bash-3.2$ cat gather_stats_for_table_GL_JE_LINES.sql

-- vi gather_stats_for_table_GL_JE_LINES.sql

SET ECHO ON;

-- Spooling the log

SPOOL 'gather_stats_for_table_GL_JE_LINES.log';

-- Unlock the table

exec dbms_stats.unlock_table_stats(ownname=>'GL',tabname=>'GL_JE_LINES');

-- Gather Stats