Long surface swim out: Take the gear off, ride on the gear, or push it ahead, and free dive now and then to relieve boredom.
Long 'surface swim' back: swim underwater as long you can, because swimming underwater is usually way more efficient and you have done the dive so you don't have to conserve air for the dive anymore.
Long 'surface swim' back: swim underwater as long you can, because swimming underwater is usually way more efficient and you have done the dive so you don't have to conserve air for the dive anymore.