A cruise ship has 2500 passengers and crew on board. At 9:00 am on Day 1, five passengers are diagnosed with Covid-19. At 3:00 pm the next day an additional twenty passengers are also discovered to be Covid-19 positive. The ship's medical officer needs to estimate when the rate of new cases, assuming no one on board was originally immune, will start to decline. When might that be expected to happen? Find the day and time.