How much flushing?

Hi all,

My first post here and it's a question :)

I bought "7 Steps to Grow Cannabis" as I am very new to indoor growing (I've never done it) and I have a question about flushing I was hoping someone could answer for me.

On page 81, it says " Take the size grow pot (in gallons) and double that number." So, if I had a 3-gallon pot, that would take 6 gallons of flushing.

The problem is that it doesn't show how often you flush or at what quantity?

For example, is it one massive 6-gallon flush that's done all in one go (highly unlikely), is it a one-gallon flush per day for 6 days, or is it a half-gallon flush per day for 12 days?