400
The U.S. and its territories cover this many time zones
What is 9?
From east to west they are: Atlantic Standard Time (AST), Eastern Standard Time (EST),
Central Standard Time (CST), Mountain Standard Time (MST), Pacific Standard Time (PST),
Alaskan Standard Time (AKST), Hawaii-Aleutian Standard Time (HST), Samoa standard time
(UTC-11) and Chamorro Standard Time (UTC+10).