I finally finished the pastel rainbow baby blanket, just a little while ago. I wove in the last few ends, and laid it out on the floor for photos, then I measured it. I can't get down on my knees too easily, but I did the best I could. Believe it or not, it's about 49 inches, point to point.
When I'm working on blankets of this size or larger, I occasionally get bored. That's when I take a break, and sew in the ends that I have accumulated so far. It works pretty well for me. By the time the project is finished, there are usually only a few ends left.
As a point of interest, I always, always, launder whatever I make, before gifting, or selling. That way I can let the recepient know exactly how I washed and dried it, and that it came out OK. Not only that, but it's always so much softer after laundering!
Only once did a blanket not come out ok, and that was for my own use anyway. I dried it on too high a heat, and it kind of melted the yarn a bit. It wasn't soft anymore. We still use it, though.
Now, it's on to the next one!