The required solo flight test time for an E-LSA RV-12 is 5 hours. However, what's legal is not always what's smart. You might have a hard time finding a good CFI willing to fly in an airplane that new. Five hours is not much time to work out all the bugs in a new kitplane. As mentioned before, mixing flight testing with flight training, especially with an instructor with low time-in-type, is a dangerous combination.
Notice I said "good" CFI-- there are lots of young CFIs out there eager to fly anything, but they don't always have the best judgment or teaching skill. Or they don't have the experience and ability to effectively teach in your particular airplane and handle it if something goes wrong. The ideal situation is to have a CFI with lots of experience flying your type of airplane, and is also willing to do the flight testing for you solo until it's legal and safe to train in. If I were you, I'd check with your local EAA chapter to see if there's anyone like that nearby.