A:AnswerThe first bottles lasted us about 11 months. Not sure how many pages, perhaps 3 reams? There was actually still a fair amount of red, blue and yellow, but the black ink running low triggered the machine to request refill.
A:AnswerYou'd have to look up your printer model to be sure. Mine is the ET 2550. You can recap the unused portion of the bottle and I don't
think it ever dries up. I don't know how many pages, I just know that when I got my printer it came with one set of bottles and I didn't have to buy ink for 2 years at least. At that point, I only needed to buy a bottle of the black ink.
I do quite of bit of printing. I have no idea how many pages.