Some exceprts from Kentaro Miuras interview with http://Natalie.mu  regarding Durank/Berserk (a thread)

Kentaro Miura:

Studio Gaga is my company with my assistants. The inking is being entrusted to my assistants for Duranki, but I did the storyboard, the draft and the final modifications.

-Berserk is also drawn by them, so what's the difference?

Miura: For Berserk I do almost everything myself, the characters and the backgrounds. I only give them the toning, buildings, soldiers, backgrounds, etc. These days I let them do the ground too.

-Berserk isn't available in every issue. With the start of Duranki, some fans might think the publication of Berserk will be delayed.

Miura: I'm quite fast at storyboarding, the main reason for the delays is my drawing speed.

Miura: I still draw almost every part myself, so it brings out more and more delays. So I hope my assistants' skills will grow with Duranki, so I get to think "this is good enough". So this can make me consider using them more for Berserk.

Casca has regained her consciousness in Vol 40 of Berserk.

Miura: I’m also filled with emotion. However, Casca's real problem has started from now on. She herself should analyze, understand and solve what happened to her. She should confront what Griffith or the monsters did.

Interviewer: This is a bit of a hard question… You've drawn "Berserk" since 1989, but are you never tired of it?

Miura: No, never. I feel like I draw a new thing each time. I've never been bored with "Berserk" and no episode has made me think "this episode has been imperfectly (poorly) done". It's probably because it's not a manga where the same patterns are repeated.

Miura: I draw the essential themes with "hard work" (he uses an onomatopoeia) and then go to the next theme. I mean I challenge myself to do something new each time. I think those who draw epic (long) manga would never be tired of it…

Interviewer: In this state, you would be reborn if you have a Beherit with you. *laughs* Where are we in the whole story of “Berserk”?

Miura: Around the later part. With the revival of Casca, the Chapter of the Elf Island is going to be ended and you can expect very surprising developments after that. Please look forward to “Duranki” as well.

Full interview that came out september (2019) translated by Puella can be found here: https://www.skullknight.net/forum/index.php?threads/new-four-part-interview-with-miura-on-future-of-berserk-and-duranki.15787/#post-256737

Basically, exciting times ahead! It will still take time for Miuras assistants to improve and be used more. I trust in the studio that the release schedule will be better eventually. As for the story, we are entering the greatest stretch of the series. Lets enjoy Berserk