HappyFox offers you to choose what information you would like to let your contact view on their contact portal. 

Applicable Plans: ✔️ Mighty ✔️ Fantastic ✔️ Enterprise ✔️Enterprise Plus

To Customize Ticket Visibility Preferences for Contacts,

Navigate to Manage >> Account Settings >>  Support Center Settings. Scroll down to Ticket preferences and tick against the desired checkbox:

Once the option is enabled, on the contact portal it will appear as follows (In this case, time spent is shown to contact):