One of the benefits of the Alfred LinkedIn automation software is that you can run very sophisticated and complex campaigns with multiple cadences and messages.
You can theoretically add an unlimited number of steps in a sequence, but you should be reasonable with your approach.
In practice, most people add between 5 and 9 steps in a sequence with multiple types of touchpoints in order to build trust and engagement (as well as a response).
But you can add as many or as few as you like.
(Please note that you can't add sequences once campaign is published)