You're talking black oil sunflower kernels?
Birds go crazy for them! They're going to love you for it, Fanci.
Try to work out how much black oil sunflower kernels your birds go through each day, that way their food is staying fresh, because you're putting it out each day. Every other day, or even twice weekly is fine, but speaking for myself I like to put out a little fresh each day.
We have a large number visiting right now, and I find they're going through approx. 250 mL of black oil seed each day.
As for our Dark-Eyed Juncos, they've been hitting the finely crushed roasted and blanched (unsalted) peanuts we've been putting out just as much as they do the white millet mix.