Whenever you want. I traditionally do all my adjunct additions towards the end of the boil. If you are doing several pounds of simple sugars, then you might want to stagger them and add some in primary. I usually wait til the first krausen falls, then add my next addition, then wait til that krausen falls before the next one, etc.
Like my snazzy new avatar? Get Sons of Zymurgy swag, here, and brew with the best.
Revvy's one of the cool reverends. He has a Harley and a t-shirt that says on the back "If you can read this, the bitch was Raptured. - Madman
I gotta tell ya, just between us girls, that Revvy is HOT. Very tall, gorgeous grey hair and a terrific smile. He's very good looking in person, with a charismatic personality... he drives like a ****ing maniac! - YooperBrew