The books of Dickens and other Victorian authors often seem over-long. Probably that’s because at the time, publishers wanted books to publish in 3 volumes, since that’s what the private lending libraries like Mudie’s demanded - they made more money that way.
IIRC from reading about all this during an OU course (the 19thC novel) books were priced at thirty shillings and sixpence, which was of course far too expensive for the vast majority.
Having got fed up with the demands of publishers and libraries, Dickens started his own highly successful magazines for serialising his own novels and those of his friends, inc. Wilkie Collins, whose novel The Woman In White was first published in one of the magazines, was a runaway success and caused a sensation.
One such weekly mag cost only 2d a week, which made it affordable for a good percentage of the masses. The mag was stuffed with advertisements - Dickens was very commercially minded!