That's because the actual novel takes years to create for two people, even with volunteers. This comic is being worked on by a whole team of artists, who churn out comics like this in a month and a half at the very least.
Wouldn't surprise me if we see half a dozen more DK comics from Pal before the next installment of the novel is out.
I'm waiting for the voyeurs to find out that "one way" glass isn't. (It actually reflects something like 20% of the light in both directions, but 20% of a bright room is way more than 80% of a dark room.)