Interestingly, my DC Metrorail trip to home or work takes between 45-60 minutes one-way... and there are no facilities on the train itself, and very few stations have any public-accessible facilities. "Holding it" has honestly never been an issue, you either go before you leave, or sack up and wait until you get home. Worst case is probably that you get sick en route and well... that alone wouldn't wreck Hyperloop.
Exactly, my experience with regional rail commuting in Philly was the same. Regional rails frequently have the sort of trip lengths that we are talking about here, and I have never seen a regional train that has facilities.
