An appointment diary?
 

I am making appointments for a student consultation day, each appointment being for 15 minutes. I know I'm going to end up doing it all in Excel, but I was trying to see if it was possible in OO3. I have certain slots of time (8-10, 10-12, 1-3, 3-5) over two days, so I thought I could enter these slots as a column and collapse it when that session was full. But I cannot get custom dates to autocomplete.

It is probably a "feature request" rather than something easily achieved; anyone managed and appointments calendar?