Thanks a lot for the fast reply and the example. I will think about how to best formulate a feature request, I am most likely trying to do a task, Tinderbox is not made for.
Basically, when one looks at a procedure and you know all the steps, you can nicely show them in Tinderbox. I like this part.
The part that can not be easily done in Tinderbox:
Then when one want to optimise the procedures based on time, you would like to know how long each step takes and what the total time looks like.
In the next step one would like to try out to modify individual steps, reduce the time and then see the total time again.
If this procedure is a step of a complex procedure consisting of the same procedure over and over again, then one would like to see the overall impact.
In case nobody needs this within Tinderbox, then there is no point in implementing it.