It depends on if the bobbin is pre-wound or self wound according to this link.
https://www.superiorthreads.com/educ...obbin-capacity
I use pre-wound bobbins all the time for regular piecing. There is a lot of thread on them. Totally worth my time to use these. Yes, I also wind about 5 or 6 bobbins at a time when I feel like it. Lazy stitcher!