Sometimes the AI Employees might misunderstand your request or think it needs more time: this is called a hallucination.
A quick way to tell: If you don't see the "is typing" indicator, the AI Employee probably got stuck. If you do see it, your AI Employee is working on something: just give it a moment.
To fix a stuck AI Employee, send a new message with the same request and add "now": for example "Generate this post now"