If you go to any boinc project site, inside your account you got a "General Preferences" I think.
In there, there's an option that is something like "Connect every x days", and you can set it for anything between 0.1 and 10 I think.
The higher the number, the more workunits your boinc will queue for later crunching.
But in some cases, boinc can only download a few workunits each time (project limitations), so you might have to click several times on the "Update" button for it to bring more and more workunits until it fills up your queue.


EDIT: Lagu... I could swear I had seen a post from you after mine... :P