The Spiritual life has no hard and fast rule. Ramana had an experience that he was dying at about 13 or 14 years old and soon after became a realised soul. It is not a 'jump' though. Ramana had many previous lives. We read and write music at three years old, only because we have had the experience in previous lives. So too, with opening the third eye. Spiritual sadhana (practice) is otherwise necessary.
The way of devotion does not advocate opening the third eye to soon. Ramakrishna, Aurobindo, my teacher Sri Chinmoy ... none encouraged it. Indeed the Path of Kundalini itself is dangerous for the untrained and requires teaching by an adept in this field. The way of Yoga is to first purify your lower nature: ego, fear, insecurities, guilt, anger, attachments, lust ...
To open the third eye untimely, will bring you constant harm and you will take a backward step. Rather allow God to act in and through you after a period of selflessness, gratitude, service to mankind and intense meditation. The way of the Heart may at first seem slow, but ultimately it is the fastest way.
. All scriptures will teach you to seek God and not His gifts. After you have found God, then the gifts comes automatically. About your meditation, it is intensity that is needed and not time or hours. A set daily and disciplined practice, with an inner commitment to love God and serve mankind will be the key.
This will open up the psychic Heart and allow you to be receptive to the higher forces raining down (Grace), without which, nothing can be done. The Heart is the centre of God's Light and infinitely higher than the third eye. But yes, the third eye is occultic and very powerful, carrying the risk of leading you crazy or astray. I hope this helps.