Phoenix is 15 hours behind Hong Kong year-round. When it's 11:00 PM in Hong Kong, it's 8:00 AM the same day in Phoenix. Neither Phoenix nor Hong Kong observes daylight saving time, so this difference is constant.
Arizona (except the Navajo Nation) does not observe daylight saving time, making scheduling with Hong Kong simpler than from other US cities.
Optimal meeting window: 5:00 AM - 7:00 AM Phoenix time (8:00 PM - 10:00 PM Hong Kong). Early morning Phoenix catches late evening Hong Kong.
Phoenix's semiconductor industry has supply chain connections to Hong Kong's electronics trading hub, with significant business coordination between the two cities.