What is LinkedIn work hours
These are the hours in which your LinkedIn automation works.
Set these to the hours in which you operate LinkedIn.
This can be set in Accounts -> Click on the LinkedIn account -> Work hours
What are Campaigns schedule hours
These are the hours in which the campaign runs.
This is based on the time zone and schedule of the campaign.
VERY IMPORTANT
For a LinkedIn automation campaign, the Campaign schedule hours and the LinkedIn work hours have to overlap to some extent (2-3 hours atleast). If there is no overlap, then the automation won't work.