Regarding the file under $APPLCSF/$APPLLOG

Hi

Could you please share me your advice on the following question

I go to $APPLCSF/$APPLLOG/ by WINSCP utility to try to download manager log, the list is very very long and it hangs.

I have schedule to run Purge Concurrent Request and/or Manager Data weekly,but still there are so much manager log and output file under $APPLCSF/$APPLLOG

so I want to delete them from $APPLCSF/$APPLLOG manually.

I run the following command to delete 60 days old mgr

find /u02/applprod/prodcomn/admin/log/PROD_oracleprod1/*.req -mtime +60 -exec rm {} \;
unix says argument too long

can you advice me how to delete the files here by date range?