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man find:
So you might need to specify -mtime +0 to find any files, as 0 alone will just find those files modified exactly NOW.

You could also use the shell built-in variable $SECONDS

#!/bin/sh
START=$SECONDS
:
#script commands go here
:
END=$SECONDS
echo elapsed time is $((END-START)) seconds

find /top/directory -type f -exec grep -l 'string I want to find' {} \;