import sys
from datetime import datetime
from pprint import pprint as pp
import os

def get_file_paths(directory):
   for dirpath,_,filenames in os.walk(directory):
       if not filenames:
           print "No files in dir"
       for f in filenames:
           yield os.path.abspath(os.path.join(dirpath, f))

time_format = '%Y-%m-%d %H:%M:%S'

ts = []

for f in get_file_paths(sys.argv[1]):
    log_lines = [line.split('][')[0][1:] 
                 for line in open(f) 
                 if line.startswith('[')]

    start, stop = [datetime.strptime(log_lines[0], time_format), 
               datetime.strptime(log_lines[-1], time_format)]

    ts.append((stop - start).total_seconds())

minsecs = min(ts)
maxsecs = max(ts)
average = float(sum(ts)) / len(ts) 

print len(ts), minsecs / 60.0, average / 60.0, maxsecs / 60.0