Apply suggestion from @serhiy-storchaka

Author: serhiy-storchaka

Lib/asyncio/windows_utils.py

@@ -23,7 +23,7 @@
 PIPE = subprocess.PIPE
 STDOUT = subprocess.STDOUT
 _mmap_counter = itertools.count()
-_MAX_PIPE_ATTEMPTS = 100
+_MAX_PIPE_ATTEMPTS = 20
 
 
 # Replacement for os.pipe() using handles instead of fds