You can quilt any size quilt in a hoop. My only advice for this is to choose a hoop size where you can reach the middle of the hoop when you place the inner side of your elbow at the edge of the hoop. If you have to reach to feel the needle come through it will be very tiring and uncomfortable ti quilt.
That being said, I have quit using a hoop. I thread baste and quilt hoopless in my lap. Much easier for me and much less pain. You hold the needle as if hand piecing and move the quilt on to the needle instead of pushing the needle through the quilt.