Make something stop what it's doing for a while?

I do i make my little cow wait? (sleep)

I've told my cow, every 5 second, to roam in a random direction, but from time to time i want her to rest more than 5 seconds; if i tell them to set speed to 0, she stops just for 5 secs until next system tick kicks in. Is there a way to force her to wait?

Do you have a capx?

Thanks anyway, i've solved the problem already! :D (i'm a fakking genious lol :P)