Which would be even longer than 3h if some EU bureaucrat didn't realize that making the default unacceptably long for everyone will result in nobody using it.
My shiny new (2025) Bosch washing machine has a big button on the front which switches from the default 3 hour programme (for 40 degree wash) to 1hr 30m. Like, it's not very _well_ hidden :)
Interestingly, the 3 hour programme isn't really a 3 hour programme. If you use it, the timer will generally start at 3 hours and drop to an hour or so after 20 minutes. I have no idea what the heuristic is, and the manual is silent on the matter.
My Bosch dishwasher takes 3 hours I guess due to efficiency, it seems reasonable. I didn’t go with a European washer dryer combo though (my laundry room has a vent and I’ve heard that heat pump tech still isn’t good enough).
Heat pump dryers are in a slightly weird place in that they're boring old tech in Europe (they've been common for over a decade), and exciting new tech in the US. This means that dryers made for US preferences (physically larger, either three phase or <1500W, etc) are generally first or second models (and thus unreliable) while those made for European preferences are mature designs (and thus reliable).
Due to ecodesign legislation, I would assume that all machines that can be legally sold in the EU would count as "uses less water" in the US.
The dishwashers are another can of worms. My last one had an EU and a non-EU program, and you quickly learned to pick the "non-efficient" one if you actually wanted clean dishes.
Even regular programs in front-loading machines (at least in the European countries I've been to, these make up the absolute vast majority of machines) are longer than typical top loaders. Top loaders are faster but put more wear on the clothes and use more energy and water. A regular, "non-EU" cycle will typically take around 2h. The EU one will typically max out the 3h limit.
It's just... inefficient? Why wouldn't we want to catch the water closest to where it comes out?