The OUPV/Six-Pack is the most popular of the Captain's Licenses and is required for those who wish to operate fishing and sailing charters, run a dive boat, or offer sightseeing tours, etc.
This license is commonly referred to as a "six-pack" because it allows the holder to take up to six paying passengers and crew out on the water.
The OUPV/Six-pack program https://www.marinerslearningsystem.com/oupv-six-pack-captains-license.html takes the average student 25-30 hours. We have had students take as little as 3 days, 3 weeks, or 3 months to complete this program.
Here is a link to a video which will provide additional insight into this level license: