Good Morning,
Interesting that GI physician's conclusion indicated that your reflux is likely due to constipation - I will have to check with my Dr. re this as a cause.
The exact causes of Barrett’s Esophagus are not known, but GERD is a risk factor for the condition. Although people who do not have GERD can have Barrett’s Esophagus, the condition is found about three to five times more often in people who also have GERD.
Since Barrett’s Esophagus is more commonly seen in people with GERD, most physicians recommend treating GERD symptoms with acid-reducing drugs.
Improvement in GERD symptoms may lower the risk of developing Barrett’s Esophagus. I cannot answer your question re how long does it take for Barrett's to become an issue.
Perhaps someone else has that info.
Take care,
Kindly,
Kitt