From the paizo.com listing:
Hand of the Apprentice (Su): You cause your melee weapon to fly from your grasp and strike a foe before instantly returning to you. As a standard action, you can make a single attack using a melee weapon at a range of 30 feet. This attack is treated as a ranged attack with a thrown weapon, except that you add your Intelligence modifier on the attack roll instead of your Dexterity modifier (damage still relies on Strength). This ability cannot be used to perform a combat maneuver. You can use this ability a number of times per day equal to 3 + your Intelligence modifier.
I'm concerned specifically with the phrasing, "This attack is treated as a ranged attack with a thrown weapon," and what it might imply. When my BAB reaches +6, will I be able to make a second Hand of the Apprentice attack if I choose to take the Full Attack action, or will I always be limited to one use of this ability per round?
It says 'as a standard action', so you won't get iterative attacks from a high BAB. The only way to get multiple attacks with that is to find some way to take an extra standard action on your turn.
