I have attached below the timetable for the IoW you can open it on a second screen and make sure to stick to it, it doesn't get much more realistic than that. I know that's no fix and won't get you the gold medal in the scenario, but if you really need that challenge for playing IoW there you have it, until they of course patch it officially. It is actually in line with the timeable mode, sadly it doesn't count for the minute you have to spend with the doors open at the start, but I'm sure you can make that time up and arrive on time anyway
