There are many reports of cats surviving for lengthy periods of time in very harsh conditions, even without easily accessible food or water. (petwave.com)
Do not leave your dog in a crate for lengthy periods of time (more than six hours) to prevent chewing. (pets.webmd.com)
For example, they may wish to take lengthy periods of time to raise children, or to cope with life challenges such as ill parents or spousal difficulties. (canadianlawyermag.com)