Realistically, there aren't enough hours in the day for everything that occurs in this episode. When the guys leave Hawai'i in the morning the sun is up, the hotel lobby is crowded and there is traffic on the streets indicating that they didn't have an especially early flight. Even if they left at 9AM Hawai'i time with a five hour plus flight time and three hour time difference they wouldn't get in to L.A. until after 5PM. When they arrive, the sun still appears high in the sky, the guys have time to go back and forth to home and Hollywood and Beverly Hills for meetings, and the offices and cafés still appear to be full of midday crowds.