How long to recover from high altitude pulmonary edema?

Few days. Usually 2 or 3 days. More severe cases might take longer especially of there are underlying health issues or major complications.
More deadly. More likely to cause death. Why? Very interesting question that researchers are hard at work trying to answer.

Related Questions

When will I recover from high altitude pulmonary edema?

Get below 7000ft. Descent is essential as well as supplemental o2 when you develop hape. Recovery can take several days, but usually you feel much better within a few hours. Read more...