I wouldn't say that as harshly as Rain is, but I'm honestly not finding good information to make an accurate length and weight in reference to Tanya's strength. The blade is long and heavy and sharp, enough to make Tanya have difficulties wielding it properly without the enchantments. I'll confess the picture isn't accurate to its length because I botched my attempt at foreshortening, it's almost as long as Tanya is tall.

I feel like anything I try and guess at would probably not be very logical in respect to Tanya's physical strength and the blade's size itself, mostly because I'm really not that knowledgeable about medieval weapons. I mean, my best knowledge comes from occasionally seeing them in a museum and Dark Souls, which isn't exactly in-depth.