I love this hint. Very good idea.

I adapted it to get it to work for zsh.
It seems to require a lot less code.
It works for me, but it might due to my particular config.
If it doesn't work for you, please let me know.

How to install:
Just add this two functions in your ~/.zshrc:

# Before a command execution
preexec() {
	# Define timer and cmd for growl notification
	export PREEXEC_TIME=$(date +'%s')
	export PREEXEC_CMD="the cmd: $1"
}

# After a command execution
precmd() {

	# Growl notify
	# Time after which trigger a growl notification
	DELAY_AFTER_NOTIFICATION=1
	
	# Get the start time, or set it to now if not set
	start=${PREEXEC_TIME:-`date +'%s'`}

	stop=$(date +'%s')
	
	let elapsed=$stop-$start
	
	if [ $elapsed -gt $DELAY_AFTER_NOTIFICATION ]; then
		growlnotify -n "Terminal" -m "took $elapsed secs" ${PREEXEC_CMD:-Some command}
	fi
}

Congratulations to sapporo for the original idea.
Enjoy!


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And change the variable DELAY_AFTER_NOTIFICATION to match your own needs (first line of code of function precmd).

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