Building a yeast starter from a bottle - how many steps?

[Perseus]

So I took my first stab at culturing yeast from a bottle. I used a couple bottles of Rochefort 8. Lo and behold, the yeast came to life. I plan to use it in a 10 % + ABV recipe and am not sure how many times I should step up the starter. I don't have a microscope to do a cell count, so does anyone have a rule of thumb?

 

[Nosybear]

Increase starter size by a factor of 10 each step: If you start with one ml, step up to 10, then 100, then 1000 and so on. Use about a 1.030 wort. See the Brewing Elements book "Yeast" for a further discussion.

 

[Perseus]

Thanks,that's the next book on my list.