I'm trying to create a meeting agenda in excel
In column 1 I have 8:30Am and in column 2 I would like to add :30 (the
length of the presentation)

In the next row I'd like it to add that 30 minutes and start at 9:00am and
then each time the length of a presentation is added it updates the start
time for the next agenda item.

How the heck do I do that? I feel like I've tried everything and can't get
it!

Thanks