The number of comic pages one can produce in a day varies greatly. Factors like the complexity of the art, the artist's skill level, and the amount of time available all play a role. Generally, a professional might manage 5 to 8 pages on a productive day.
It really depends. Some experienced comic artists might be able to do 10 or more pages a day, but for beginners, it could be just a couple.
Well, it's hard to give an exact number. It could range from just one or two for someone who's new to creating comics, to maybe 15 or more for a seasoned and fast artist with a lot of time on their hands.