Its right next to Sueno Del Mar. My trips averaged 25 min... 20 min in the fast boat, maybe 30 in the slower boat. As others have said, don't just take off from the beach anyplace, without some kind of Marker, i.e floating dive flag, or kayak that you tow with you.
When I went with Greg Smith, (turtleman) he would stay out there until you were ready to come in. He'll take you to the easy stuff, and if you are game, even the outside of the reef.