On the Bash programming language (scripting language) command line on Linux PC/server, this article introduces how to output the number of seconds since the last update of files in a folder.
calc3 " "$( date +"%s" )" - "$( find /mnt/e/_downloads/ -type f -printf '%Ts\n' | sort -r | head -1 )" "
yuis ASUS /mnt/c/pg$ types calc3 pythonprint3
alias calc3='pythonprint3'
pythonprint3 ()
{
python3 -c "print($1)"
}

The following gives you how many hours have passed.
calc3 " ( "$( date +"%s" )" - "$( find /mnt/e/_downloads/ -type f -printf '%Ts\n' | sort -r | head -1 )" ) / ( 60 * 60 ) "
0.19111111111111112