What does it feel like to be late to an appointment in Germany or Switzerland?

Being of italian decent (first generation american) and knowing most italians are pretty laid back, i am never late, to anything. So much so that the first thing out of my mouth after getting to a job interview a half hour early is if i'm ever late, i'm probably dead or someone or something effected my plans that was completely out of my control.

One job i had, i remember having no idea where it was and before smart phones / gps (it ended up being in some obscure business park) so i drove there the day before so i could gauge the time, then went back home. still showed up for the interview a half hour early.

My mother is German. My father was career military. "On time" means "I will arrive at least 15 minutes early."

Duh.