There's a time machine that will allow you to travel into the past, either your own or before your time, for only 5 minutes. 300 seconds. That's not a lot of time, so you'd have to be specific. You could go back and alter some part in your past, or tell your younger self a message. You could travel to some distant age, maybe to see Jesus on the cross or to see if you can get a hold of a rifle and a clean shot at Hitler. You could travel into the distant past and seen a dinosaur. You could travel into the past 5 minutes ago and changed a dreadful incident that just happened. Whatever. 5 minutes.