Speaking of HZ's anime.
I've been thinking about HZ and about some anime possibilities. We know it will cover the first 17 volumes and 159 chapters of content. The fact that they straight up claimed it will cover volumes 1-17 makes me assume it will be a continuous adaptation. With a pace of around 3 chapters adapted per episode, 17 volumes would fit nicely in 48-52 episodes.
Not many studios are willing to take on such long projects any longer. Then there's also the TV network aspect and timeslots.
HZ could air in Summer in the earliest, if that were the case, it would probably be an NHK production. The problem is, NHK have way more anime announced for this year than usual, but there is speculation that NHK will expand their anime block to fit two shows. There's also the educational NHK channel and other satellite exclusive NHK channels that can have anime. NHK have a strong connection to sumo, so it would make sense to for them to fund this anime, but it isn't set in stone.
HZ could also take the place of BC when that finishes, in Fall. Would that mean Pierrot would end up doing it, that would be weird. Toei also like their long anime and if Toei do it they'll surely find somewhere to air the adaptation.
Then there's the option where the show will be adapted in 2 two cour chunks, with breaks in-between. For a high quality adaptation, this would be the most viable option and it would fit NHK's way of doing things. But the announcement for the TV anime said it will cover the first 17 volumes, so it most likely means we'll get 4 continuous cours.