Not sure where else to put this as I can't find a contact link but I've noticed that the duration selector on the main site is mislabelled.
The increments go
The second one I'm pretty sure should be "Between 2 and 3 hours"
I've checked and the walls that are 3-4 hours long don't come up in the 2-5 hours list. Which you would expect them to do if the labelling were correct.
It also just doesn't fit in with the rest of the selection options.
Should be a simple fix. The logic is correct. Just the labelling is wrong.