475 related information REQUIRED Please reply

Hi all ,

i just want one information regarding 475 visa.

My friend" Mr N.D Raj" is on 475 visa. he got his visa approved in 2010 and he stayed in Australia for 6 months now he is back. His visa expiry date is 2013.

He knows that to get PR he has to live in Aus for 2 years atleast and has to work at tfn for 1 year.

But due to some reasons he may not go for next 18-20 months (1.5 yr - 2 yrs). and after that if he will go,
Can he get visa extension because he may not having much time to fullfil his 2 yr condition?
if yes How he would apply for this?
Should he has to apply for new visa or which visa type he has to apply?
If there is provision of extension then how much time he will get extension on his visa?

Please answer some of these questions.

and also give some suggestions regarding his case if he do this?

Thanks for helping my friend.