This site's own realistic-timeline table names this specific detail directly: less end-of-day chest heaviness, as a realistic week 3-4 expectation.
Worth reading "end-of-day chest heaviness" and "smoother morning breathing" as two distinct times of day this site names specifically — worth tracking both separately if you're evaluating your own experience against this timeline.
Michael T.'s featured quote specifically describes better airflow and less discomfort during light activity — worth reading his account alongside this end-of-day detail as related, though not identical, reported experiences.
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