Re: Bewildered. (That's grown-up speak for "wtf")
Presumably if you had a dishwasher with a clock, the "finish by" time could be set in a similar way as the "start time" delay, by holding down one button and repeatedly pressing another. That's if you really are unable to calculate a delay time - 1.5 or 2 hours or however long the washing cycle is - at least a couple of hours more for the warm air to dry them.
Then again, this kind of feature is aimed at people who cannot set clocks on kitchen appliances and probably have UPnP on their routers and will never run a security update in their life unless their computer or phone bludgeons them into it (note all the missing devices from that list), so it's all going to end in tears anyway.