I hope this is the right place to ask this question

My wife an I are about to apply for a non lucrative visa. We would like to spend most of each year in spain over the next 3-4 years. Though we will also maintain a residence in Australia - we are retired Australian citizens.

It seems that the non lucrative visa (if we get it) will need to be renewed/extended each year.

I also understand that the renewal/extension must be applied for in Spain

I have not been able to find any information on the renewal/extension process. Can anyone shed some light on this for me.

In particular, how long does it typically take. ?
Does it require as much paper work and the original application.?
Could we travel back to Australia while the renewal is being processed.?

Thanks in advance to anyone that can add to our understanding

Rob