Take a Long Vacation (Unlimited Vacation Days) by ShuSanR at Mod The Sims

This interaction will allow sims to get a long vacation without any activity restriction and the vacation will not end autonomously. A reward trait of “On Vacation” will appear in the sims personal info panel. You could “Return to Work” on the mobile phone.
You don’t have to have Vacation Available Days to do this interaction, the Long Vacation won’t decrease the Vacation Available Days.
If you applied the “Return to Work”, the vacation won’t end immediately, it would need 1-3days to reset the state.