It would be an 8 hour overnight, followed by a 10 hour daytime. Same
on the return.

Total per person upgrade cost would be $1000 for the round-trip; base
coach airfare is $1700.



In my view, it's worth the $1000. An 18-hour trip is a monster and you'll
have the added benefit of lounge access, maybe priority checkin and
fast-track security. What's the routing?