The "Personal" Tab in the DOff UI was initially named "Shipboard"
later the Department Heads were added and to counter some possible confusion the "Shipboard" Tab was renamed to "Personal".
I just noticed in the lower left corner of the DOff UI there is still the 1 hour Timer and it is still named "Shipboard", which may make some people think that their Department Heads timer resets every hour, instead of every 20 hours (btw. having a Timer for that in the UI would be nice to have too.).