** I was wondering whether there is a standard time delay between adding an event and it actually showing up on the calendar? **
No, it should be immediate. It may be possible that an old copy of the calendar display is be being cached by your browser or ISP. Try refreshing the browser (in IE while holding the [Ctrl] key, In Netscape or Mozilla while holding the [Shift] key) to see if it changes.
Or it could be as Sarah said, the user didn't have permissions set to allow their events to be 'automatically approved'. BTW. If posting as the Administrator, the events should go directly onto the calendar without needing any kind of approval first.
Dan O.
[This message has been edited by DanO (edited January 07, 2005).]