Hi Manas,
this table should have never been as big.
instead of reorg, I would ask my BW team if they really need active data in this table. If only contains error logs, no important data is in this table. If So, simply truncate this table in SQLPLUS. This is gonna take a few seconds to a few minutes and will resolve your issues. Do this at a quiet time when BW is not used that much to avoid issues.
Next, search SAP notes about this well-known table and run proper programs to delete old stuff from it. it should have never been to this size!