LastPlayedFu will display the time in day, hours and seconds since you last played an alt.
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Good news, limited followers of LastPlayedFu.  The maintainer of RestFu has integrated Last Played functionality into RestFu!  

So v1.4.4 will be the last release of LastPlayedFu, and will be pulled from CurseForge when the WoW 3.2 is released.

I strongly recommend you get RestFu 1.3.1+ for your last played functionality, as this is where it is best displayed.

- RJH 24-May-2009

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Originally, I tried to get a modification to FuBar_RestFu.  The request has yet to be reviewed.  I made changed to the existing RestFu, but I'd like to be able to get updated for that again, at some time, so I created this separate addon (read: copied and hacked RestFu to do my bidding).

I've found this tool useful to track just how long it has been since I logged into a toon.  This is especially handy when trying to work out just how long an alt has been sitting at 150% rested, or if your full mailbox is about to purge back to the AH.

- FAQ
Q. How hard would it be to port this to Titan?
A. Not sure, as I don't use, and am not familiar with the Titan libraries. It would be fair to say that I'm not all that familiar with the FuBar ones, either, but it's what I use and am willing to support.  Feel free to clone the project and add Titan support for it.