I just pulled out a chart. It's only 30 nm from Dana Point to Cabrillo Marina. The course is 288, which will put the wind on the nose on most days.
Since I don't know how well the little outboard will push your boat, it's difficult to predict how long the trip will take. I'm guessing 6-7 hours.
If the winds are typical NW when you leave, and if you don't want to motor, you might want to sail to Avalon, spend the night, and sail to SP the next day. That makes a nice trip. Avalon to SP is generally 3.5-5 hours, depending on wind. Dana Point to Avalon will take a little longer.