Currently I'm knitting a super giant economy size adult sweater on needles which, while loaded with stitches, stretched out on a yard stick look to be about 33" tip to tip. I don't know what they'd measure empty. I'm knitting flat, not in the round, and the stitches aren't falling off. When I knit them onto a longer cable to see how the size is working out, I'll get a more accurate measurement of the needles if anyone is interested. I'm working with Lion Brand Pound of Love which the label says is 4- ply worsted weight, no number that I can find, but I consider it a light worsted. A heavier yarn might not work on this length of needle.
Happiness is catching that dropped stitch while it's still fixable..