time -h option not working?

[Carl Morley]

Hi,
I just tried to use the time command to time a process, but with the -h
(human readable) output option:

Eg. time -h ping -c 5 some_ip_address

But I get back:
-h: Command not found.
0.000u 0.000s 0:00.00 0.0%      0+0k 0+0io 0pf+0w

What am I doing wrong?

Cheers,
Carl.