The Apple Watch is a bit more fleshed out today, but one large thing remained to be answered. How long is this thing going to last?! While that’s always going to depend on your usage, CEO Tim Cook says it will have “all-day battery life”, and a “typical day” will get your 18 hours battery life. While that’s not exactly smartphone-level performance, the Apple Watch isn’t sporting a smartphone-level battery. With 18-hour battery life, it will likely appeal to more of us.