Adding more water when making broth / stock using pressure cooker

I read few recipes for making broth or stock using pressure cooker.

If I add more water, do I need to add more cooking time? 

For example, a recipe like this:

- 1/2 kg of chicken wings

- 1 onion

- 1 leek

- 8 garlic cloves

- 3 star anise

- 2 liter water

- 30 minutes pressure cooking, start the timer after the high pressure reached

Now, I want to make for 3 liter water, for more person.

Do you think that I must add more pressure cooking time? 

I think I must add half more portions for other ingredients as well:

- 3/4 kg of chicken wings

- 1,5 onion

- 1,5 leek

- 12 garlic cloves

- 4,5 star anise

- 3 liter water

But, is it then the same 30 minutes or .... 45 minutes?