When you feel the urge to go, you should go. We try to schedule our bathroom visits around convenience, but when the body is giving signals that it wants to get rid of something, that is when it's most ready to do so. Delaying can cause stool to sit in the colon, which acts like a sponge. This can lead to hard stool that is more difficult to pass. On the flipside, do not force yourself to go when you don't have to.