how to move lob column to different tablespace in a fast way?

This database version is Oracle 12c. One table has one clob column which has size 60G.

I use this sql to get size:

SELECT SUM(DBMS_LOB.GETLENGTH(lob_column))/1024/1024 as total_MB

FROM table_name;

The I use this SQL to move this lob to different table space:

ALTER TABLE table_name MOVE LOB(lob_column) STORE AS (TABLESPACE tablespace_name);

The trouble is this alter ..move took 30 hours to finish.

My Question is: is there any way to make this move fast? 30 hours down time for production is too long.

Appreciate your help!

Thanks

Jin