Large variable in bash script, is it wise?

Hello,

in my script i need to find newly added files added accross server HDD and check if they contains certain phrasses (30 phrasses)
so i made something like following code, but i dont know if its wise that find command in variable (it can match like tens of thousand file paths..), or how would you do it better to be less performance hungry..? thank you

for filepath in $(find /home ***);do
for phrasse in $(cat phrasses);do
grepout=$(grep ***)
if [[ "$grepout" == *"some phrasse"* ]];then
echo "phrasse found in $filepath"
fi
done
done

why not limit the search to a date range

start_date=201105040000

end_date=201105042359

touch -t ${start_date} start

touch -t ${end_date} end

find /you/path -type f -name '*you*pattern*' -newer start ! -newer end -exec ls -s {} \;

Second one: find files modified between 20 and 21 days ago:

find -ctime +20 -ctime -21

finds files modified between 2500 and 2800 minutes ago:

find -cmin +2500 -cmin -2800

Thx, im using something like what You suggestedin the "find" command, but still there are quite alot of results (im searching thru around 15 linux filesystems), thats why im sking what im asking.. if my script is issue (too alrge variable) or how can i do it elseway?