I know there is a timeline report via google but has anyone considered developing a traditional timeline, where a single line exists, or I suppose it could be broke out by units of time into separate rows or columns depending on if you are viewing it horizontally or vertically. You have a start time, stop time, and events in between the two points where a line sticks up off the edge of the time line leading to the event text?

This is a crude drawing to get the idea.

Naturally I would think the option for major and minor tickmarks would exist as properties. Group by time units to span multiple lines perhaps.