Epson UltraChrome HDR 11-Cartridge Ink Set for Stylus Pro 4900 Series Printers (200 ml)

Shelf life is approximately 2 years. But I have used ink that has been outdated 4-5 years without any drying issues or degradation of quality. Once the cartridge has been opened, you should have at least a year before any type of quality issues start to occur.

Epson printers come with a built in feature that allows you to figure out exactly what each print job costs. Through the Job History feature, you can see exactly how much ink was used on a print job. The Job History stores the last ten jobs printed by the printer.

That depends on a number of variables, not the least of which is the size of prints being produced. Unless you're frequently doing very large prints, the shelf life of the cartridge will be exceeded before you run out of ink. I've been very impressed with the number of prints possible with a set of cartridges, although I did have to replace the black cartridge earlier.

Well it depends on the color of the ink and the color of the picture. The 4900 uses color ink even to print B&W pictures . So it is a question that needs more information to answer.