Update messaging for --durations when not in verbose mode.

changelog/4063.trivial.rst

@@ -1 +1 @@
-Exclude 0.00 second entries from ``--duration`` output.
+Exclude 0.00 second entries from ``--duration`` output unless ``-vv`` is passed on the command-line.

doc/en/usage.rst

@@ -269,6 +269,7 @@ To get a list of the slowest 10 test durations::
 
     pytest --durations=10
 
+By default, pytest will not show test durations that are too small (<0.01s) unless ``-vv`` is passed on the command-line.
 
 Creating JUnitXML format files
 ----------------------------------------------------

src/_pytest/runner.py

@@ -51,6 +51,7 @@ def pytest_terminal_summary(terminalreporter):
 
     for rep in dlist:
         if verbose < 2 and rep.duration < 0.01:
+            tr.write_line("0.00 durations hidden.  Use -vv to show these durations.")
             break
         nodeid = rep.nodeid.replace("::()::", "::")
         tr.write_line("%02.2fs %-8s %s" % (rep.duration, rep.when, nodeid))