How much exercise does a Boxer breed need?

Unfortunately I am being told different things for an adult Boxers exercise requirements

Some say “45 minutes to an hour”

Some say “2 hours minimum”

Some say “4 steady 1 hour walks a week and 3 days of going out for high intensity running for 30 minutes”

I love the look of the breed (they look fun And exciting) but at the same time I wouldn’t want to get one if I can’t offer it what it needs exercise wise.

Any advice is appreciated