Improve formatting of longer download times in download tracker

Author: Manishearth

src/rustup-cli/download_tracker.rs

@@ -176,10 +176,25 @@ impl fmt::Display for HumanReadable {
 
             if sec.is_infinite() {
                 write!(f, "Unknown")
-            } else if sec > 1e3 {
+            } else if sec > 48. * 3600. {
                 let sec = self.0 as u64;
-                let min = sec / 60;
-                let sec = sec % 60;
+                let d = sec / (24. * 3600.);
+                let h = sec % (24. * 3600.);
+                let min = sec % 3600.;
+                let sec = sec % 60.;
+
+                write!(f, "{:3} days {:2} h {:2} min {:2} s", d, h, min, sec) // XYZ days PQ h RS min TU s
+            } else if sec > 6_000. {
+                let sec = self.0 as u64;
+                let h = sec / 3600.;
+                let min = sec % 3600.;
+                let sec = sec % 60.;
+
+                write!(f, "{:3} h {:2} min {:2} s", h, min, sec) // XYZ h PQ min RS s
+            } else if sec > 100 {
+                let sec = self.0 as u64;
+                let min = sec / 60.;
+                let sec = sec % 60.;
 
                 write!(f, "{:3} min {:2} s", min, sec) // XYZ min PQ s
             } else {