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> X axis is time

That's not correct from what I'm reading.

The span on the x-axis is the amount of time spent in a function, but not the passage of time left-to-right.

If you are sampling the stack at equidistant points in time (or, sampling theorem and all, fast enough) and then determine the width on the basis of "seen in fraction of samples", that's pretty close to time. (timespan if you want)

I down voted you because I'm on a phone and my thumb is a bit bigger than the voting triangles - apologies.

Thank you. Very succinct explanation. I like that.