core: Increase display time report_success word length and reading time.

Author: srdeotarse

zulipterminal/core.py

@@ -447,7 +447,9 @@ def report_success(self, text: str) -> None:
         """
         Helper to show a success message in footer
         """
-        self.view.set_footer_text(text, "task:success", 3)
+        self.view.set_footer_text(
+            text, "task:success", float(len(text.split()) * 6 / 13)
+        )  # Average reading speed = 130 wpm
 
     def report_warning(self, text: str) -> None:
         """