A good place to idle for 24 hours in game time, indoors, is above Kids Choice Clothing right when you first enter Paradise Plaza. From the silver door, go forward, staying on the right side. You will see the first set of stairs, jump up from first set of stairs to blue area above and you'll be fine. After 24 hours in game time (check watch) left on d pad, trophy will pop. Note: plug in controller so it doesn't turn off.