
I have an American and compared to my English, he does have less energy and is more laid back overall. He is often busy indoors, but that is more with chewing toys etc rather than getting into trouble, he is a proper spaniel though and will always be under your feet if given the chance. He is one of these dogs that take as much exercise as they get, but doesn't mind missing a day here or there.
Having said that they are gundogs and they do need a reasonable amount of exercise to keep them healthy and happy. Mine will walk as long as you let him and he loves any activities (agility, obedience, doggie dancing etc), but he isn't adverse to a day in peace and quiet at home.
My guys (all of them, including my American) get a one-hour walk a day and sometimes more at the week-end (and during the summer we are often at obedience shows all day on Sundays) and one or two training classes a week.