PlayableGraph duration calculating or updating

I am taking a playablegraph generated from a timeline.
I then remove some of the playables from it.

This should result in the overall duration changing based on which playables are still connected.

But the timeline duration never changes. This is ok, if i could at least get the new duration of the playable graph.

I can't seem to find anyway to get the overall graphs duration. I see where I can get/set a playables duration.
But looking at the playablegraph visualizer the playables have durations but they do not add up to the total time. Due to overlaps etc.

Is there a method or a way to calculate a graphs duration?

 

I still have the timeline asset. I suppose I could walk all of its tracks and clips and be able to look at their end times? Ignoring the ones I would disable to calculate the new duration.

I had a way to mute the tracks before playing but didn’t like it because it modifies the asset in the editor.

On a side note how do the playables in a graph know when they should start? Do they not have some start end times? Is that only stored in c++ side?

 

It seems it may be better to just have multiple timelines then.

Thanks