recursive table - response (3) by bikky6

This is the output of my recursive query.My strong point is
Is it necessary to give any control like LEVL<10 like that or Will it stop based on the data.Please give me clarity.
MERGE_ID REM__ID  dw_eff_dt first__MERGE_DT curr_merge_dt Hierarchy   LEVL
 1 935275 935275 2013-11-22 9999-12-31 9999-12-31 \    1
 2 447173 935275 2013-11-22 2013-11-22 2013-11-22 \  935275\   2
 3 25085 935275 2013-11-22 2013-11-22 2013-11-22 \  935275\  447173\ 3