If you are requesting a new approval for the same device that already has an approved request and is in a usage window, you will need to wait for this window to end before requesting a new approval with a new time.
When you using token, this have One Minute to accept login from One IP address. If you need connect again need use another token from another IP address, you need wait a new token to auth again, but if same account you have a first session finished when start a new login.