It's going to be the size of an albatross, it falls a little short of a wandering albatross for weight, that's a really big bird. It's 10x the size of the existing flying squid.
There are tradeoffs in the ability to fly long distances, the biggest being that the squid are going to come out as not great swimmers due to the large wings which will be largely dead weight in the water. Birds of that size normally need a good solid run-up facing into a headwind to get into the air. Getting this beast up to a suitable speed with anything short of shoving a turbofan up its jacksie is unlikely to work.
In terms of readability of any story, the best answer is not to worry about it.