I think it's a requery among your downloads in waiting every 45 minutes. So one file in requery means a requery for that file every 45 minutes. With eight files in requery a particular file gets a requery every six hours and the other seven fill in the remaining 45 minute spots (8 files * 45 minutes = 360 minutes).

That's not what the GUI appears to do (300 second countdowns per file) so maybe someone can clarify.