9:00 pm PT might be unsuitable for CDT time zone
When planning a call between Pacific Time and Central Daylight Time, you need to consider time difference between these time zones. PT is 2 hours behind of CDT.
It is 9:00 pm in PT. This does not fall within the span of usual working time between 11:00 am and 6:00 pm in CDT, but it still might be suitable to arrange a meeting, since it would be 11:00 pm in CDT, which is between 7:00 am and 11:00 pm CDT time.