does mean we are travelling for 15 hours or do I have the time zones and times wrong?

Can you also tell me which airline it is with?

It will take approximately 15 hours, yes. There is a wait in Minneapolis for a couple of hours, so don't worry you will not be on a plane for all of this time. The airline for this trip will be Delta Airlines.

I hope this helps.

Kindest regards,

Monty