Apollo's brows shifted a fraction more at her change in subject, but he'd been anticipating questions, at some point. "I can't give you a true number. Thousands of years, despite what this face tells you," he added, with a cool wink, keeping it light in case the overwhelming number of years dragged her down, though he didn't think it would. Not Cin. "As to how it works... which aspect? Powers? Immortality?"