@Arctic_Alex, I feel for you. Any journey that requires a large number of connexions and has several different modes of travel is always going to be fraught with uncertainty. I know that just trying to get to Oslo last year from Perth took me just over 46 hours, but quite a lot of that was in transit at airports (about 19 hours between flights). So only the end points had modal changes that were points where one could get delayed waiting for a train or a bus. The start wasn't too bad, as I had been staying with my daughter perhaps 15 min from the airport, so I didn't have the issues that
@Lindsay53 would have getting to an international hub. But between Qantas and British Airways, I had over 13 hours to kill in London, and I wasn't booked through as a transit, so I had to collect and re-check my bags. I quickly figured I could get across to Rochester, where my son works, and have lunch with him in the time I had available. That was a far better use of my time than sitting around Terminal 3 twiddling my thumbs!