how long do apple 2 factor authentication codes last.and can a hacker get through a 2 factor authentication somehow?

In order to get past 2-Factor Authentication, a hacker would need 1) your Apple I.D., 2) your Apple ID passcode and 3) access to an unlocked trusted device.

While it is theoretically possible for someone to hack your account even with 2FA, it is highly, highly unlikely. What is also not very likely is that any information you have is worth anyone spending that sort of effort on you.