$ ./python -m unittest Lib.test.test_ftplib --durations=5 
..........................................s.............................................
Slowest test durations
----------------------------------------------------------------------
0.203s     test_with_statement (Lib.test.test_ftplib.TestFTPClass)
0.204s     test_retrbinary_rest (Lib.test.test_ftplib.TestTLS_FTPClassMixin)
0.214s     test_with_statement (Lib.test.test_ftplib.TestTLS_FTPClassMixin)
0.881s     test_mlsd (Lib.test.test_ftplib.TestFTPClass)
1.162s     test_mlsd (Lib.test.test_ftplib.TestTLS_FTPClassMixin)

----------------------------------------------------------------------
Ran 88 tests in 5.264s

OK (skipped=1)

$ ./python -m unittest Lib.test.test_ftplib --durations=0 -v
test_abort (Lib.test.test_ftplib.TestFTPClass) ... [0.002s] ok
test_all_errors (Lib.test.test_ftplib.TestFTPClass) ... [0.001s] ok
test_cwd (Lib.test.test_ftplib.TestFTPClass) ... [0.001s] ok
test_delete (Lib.test.test_ftplib.TestFTPClass) ... [0.001s] ok
test_dir (Lib.test.test_ftplib.TestFTPClass) ... [0.041s] ok
test_mlsd (Lib.test.test_ftplib.TestFTPClass) ... [0.880s] ok
test_nlst (Lib.test.test_ftplib.TestFTPClass) ... [0.092s] ok
test_parse257 (Lib.test.test_ftplib.TestFTPClass) ... [0.002s] ok
...

Slowest test durations
----------------------------------------------------------------------
0.000s     test__all__ (Lib.test.test_ftplib.MiscTestCase)
0.002s     test_pwd (Lib.test.test_ftplib.TestFTPClass)
....
0.140s     test_storbinary_rest (Lib.test.test_ftplib.TestTLS_FTPClassMixin)
0.148s     test_data_connection (Lib.test.test_ftplib.TestTLS_FTPClass)
0.154s     test_storlines (Lib.test.test_ftplib.TestTLS_FTPClassMixin)
0.175s     test_retrbinary_rest (Lib.test.test_ftplib.TestTLS_FTPClassMixin)
0.204s     test_with_statement (Lib.test.test_ftplib.TestFTPClass)
0.208s     test_with_statement (Lib.test.test_ftplib.TestTLS_FTPClassMixin)
0.880s     test_mlsd (Lib.test.test_ftplib.TestFTPClass)
1.281s     test_mlsd (Lib.test.test_ftplib.TestTLS_FTPClassMixin)

----------------------------------------------------------------------
Ran 88 tests in 5.396s

OK (skipped=1)