Oh, those good old days when I had time to have a buffer. I used to have one when the Support Program was still active. I had two pages for the early release and then two page buffer. So fo regular readers, it's like a 4 page buffer.
Now, because of college, work and preparing for finding a full time job, I have 0. I do recommend a consistent schedule (in other words, not what I've been doing lately). The only time I would have hiatus after finishing a chapter is to work on writing up the next chapter and drawing the thumbnails, which can take hours.
How long does it take you to complete a single page? My work takes less than 20 minutes on paper and 4-6 hours to ink it digitally and add panels, speech, tones, etc. 8 hours tops. Depending on how busy you are, once a week is pretty good. Twice a week is better but quite a bit of work.
JJ