> Also the arrival/departure times showing "hundreds of minutes" is confusing. Anything over 90 minutes should probably display as hours:minutes instead.

Would help with usability but overall seeing this is pretty normal in my part of Europe. I've seen 200+ min delays, written just like that, many times.

Is there any point of using cumulative minutes rather than standard time format that I may not be considering?

Is that something that should be improved? Or is that just a “we’ve always done it that way but no one knows why, so we are going to just keep doing it that way” thing?