anchor.diff:      %% check 3s & 2s < 4s
       Ms = timer:now_diff(now(),?config(t0,Config)),
       test_server:comment(io_lib:format("~p",[now()])),
  -    if Ms > 3500000 -> exit({bad_parallel_exec,Ms});
  +    if Ms > 4000000 -> exit({bad_parallel_exec,Ms});
          Ms < 3000000 -> exit({bad_parallel_exec,Ms});
          true -> ok
       end.
  
positive.code:     %% check 1s & 1s & (3s & 2s) & 1s = ~6s
      Ms = timer:now_diff(now(),?config(t0,Config)),
      test_server:comment(io_lib:format("~p",[now()])),
      if Ms > 7000000 -> exit({bad_parallel_exec,Ms});
         Ms < 6000000 -> exit({bad_parallel_exec,Ms});
         true -> ok
      end.
  
negative.code:     %% check 1s & 1s & (2s & 2s) & 1s = ~3s 
      Ms = timer:now_diff(now(),?config(t0,Config)),
      test_server:comment(io_lib:format("~p",[now()])),
      if Ms > 4000000 -> exit({bad_parallel_exec,Ms});
         Ms < 3000000 -> exit({bad_parallel_exec,Ms});
         true -> ok
      end.
  