Two hours, and a genuinely workable overlap
Central to Pacific is a subtraction of two hours on every date. Both zones follow the same daylight-saving calendar, so the gap does not move through the year.
The friendliest of the American long-haul pairs
Two hours leaves a substantial shared day. Standard office hours in Chicago, 9:00 AM to 5:00 PM, map to 7:00 AM to 3:00 PM in Los Angeles, so the overlap from 11:00 AM Central through to 5:00 PM Central is comfortable for both sides. Compared with the coast-to-coast three-hour gap, this pair rarely forces anyone into an unpleasant hour.
Where each zone reaches
Central covers Texas, Illinois, Missouri, Minnesota, Louisiana, Tennessee's western half and most of the plains. Pacific covers California, Washington, Oregon and most of Nevada. Between them sits Mountain, so a Central-to-Pacific conversion skips a zone: if a third participant is in Denver or Phoenix they are one hour behind you and one hour ahead of the West Coast, or in Arizona's case, sometimes level with it.
The edges of the day
Anything before 2:00 AM Central falls on the previous date in Pacific, which matters for scheduled jobs and overnight batch windows more than for meetings. A midnight Central cut-off has already passed at 10:00 PM the previous evening on the West Coast.