10:00 am EST might be unsuitable for PT time zone
When planning a call between Eastern Standard Time and Pacific Time, you need to consider time difference between these time zones. EST is 2 hours ahead of PT.
It is 10:00 am in EST. This does not fall within the span of usual working time between 9:00 am and 4:00 pm in PT, but it still might be suitable to arrange a meeting, since it would be 8:00 am in PT, which is between 7:00 am and 11:00 pm PT time.