The biggest difference between time and space is that you can't reuse time.
Leo, Jason said, you’re weird.Yeah, you tell me that a lot. Leo grinned. But if you don’t remember me, that means I can reuse all my old jokes...! - Rick Riordan
Fond memories are some of the richest possessions you can have. They never wear away no matter how often you reuse them ! - Rj Barber
Nothing lasts forever. But the thing is, you can reuse some. Use your mind. - Leo's Mother, The Lost Hero - Rick Riordan