They are HIGHLY variable, and range from 1 day to 17+ days.

Here are a couple of recent ones:

Airline home-JFK.
Operate JFK-ANC.
Operate ANC-ORD.
Airline ORD-HNL.
Operate HNL-AKL-MEL.
Airline MEL-SYD.
Operate SYD-SGN-PVG.
Operate PVG-SYD.
Operate SYD-BNE-SIN.
Airline SIN-PVG.
Operate PVG-ANC.
Airline ANC-HNL.
Operate HNL-MEL.
Airline MEL-home.
20K miles credit on UAL that month.

Airline home-ORD.
Operate ORD-HNL.
Scheduled:
-Airline HNL-ORD.
-Operate ORD-PVG.
-Operate PVG-DXB.
-Operate DXB-EBB-NBO.
-DH on company NBO-AMS-FRA.
-DH ground FRA-HHN.
-Operate HHN-WRI-JFK.
Changed to:
-Operate HNL-SYD.
-Operate SYD-PVG.
-Then ?????? have no idea after PVG. Scheduled for 5 more days after arrival
in PVG.

cliff
HNL