Perpendicular line endpoints (duration)


The Abstract
I would like to show duration for a process using a number/duration line, like below:

 

The Problem
However, the best I can get is:

Aligning and straightening the lines are next to impossible (and sometimes very unruly in their creation and orientation when not attached to objects).
 

Possible, but unsatisfying, solutions:
I can use other line terminators (like filled circles), but they are not as universally understood/clear as line terminators for indicating time.

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