How long can an humpback whale hold its breath?

3omillion seconds

Humpbacks have been known to be down longer than 45 minutes, diving several hundred feet. When they rise, they exhale very loudly while sending a plume of cooled air up to 20 feet. They exchange over 90% of the air in their lungs being extremely efficient breathers. The larger the whale, the higher the 'blow'. The height of blows also is dependent on the activity at the time. When fighting, the blows can be easily heard, sometimes with a 'wheezing' sound when very labored. A resting animal wouldn't be breathing as loudly.