Typically I use only one white/off white for all of my sewing and quilting....
I fill 5 or 6 bobbins up at once. I find this so much easier when the bobbin runs out. I used to fill it only one at a time but find this works for me. Have picked up some more empties, so will fill more next time. I am surprised just how much time it takes one at a time, not to mention disrupting the sewing. Just a random thought for this cold, cold day.