In-Game "Total Time Logged In" Clock

Hello. Some of your subscribers keep backlog journals of their progress through their games and would like to have an in-game clock that keeps track of actual logged-in play time - like how it was implemented in Final Fantasy XI. Would this be too much of a problem to incorporate? Maybe have it show in the log/chat window via a prompt...such as:

/clock ...or
/totaltime

Thank you for your time, and please keep up the great work on A Realm Reborn. It's such a spectacular re-imagining.