Unless you hacked the person's account, there is no way to do what you're asking. You sure don't want to hack someone as you will get in big trouble. Sorry but I know of no way for you to do that legally.
How do you check the last time someone was on their e-mail? I know that sounds creepy, but how do you check the last time someone accessed their G-mail account? Can I find this out using my account?
