To add a day pass to your account to login as an occasional agent, please navigate to Admin -> Account settings -> Day pass to purchase day passes in multiples of 5.
Kindly note that this option is only visible to agents with the Account Administrator role.
A day pass would be valid until the end of the day based on the agent's time zone on the accounts that are on the Garden plan or higher. For the Sprout and Blossom plans, the day pass would be valid until the end of the day based on the helpdesk's time zone.
There is no limit to the Occasional agents that can be added to one account, and an Occasional agent could use as many days passes as they like.