For many people with DID it is literally losing time, that it is to say that one can start the day at 8am and then find yourself at 5pm not knowing what you've done. That can be very scary and disconcerting. But there are varying degrees of it. Dissociation is a normal part of the human existence, many people do it when they are in a traffic jam without thinking. And it's a coping mechanism for those in traumatic situations. It is only a problem if it is happening often or disrupting your life.