Each Blockprinting kit makes 100ml (a little less than half a cup) of paste. How far that paste will go depends on the design and how you apply it - you can keep printing until the pigment paste runs out, but how fast that happens will vary greatly based on what you're printing with and how much positive/negative space there is in your design. For example, if you're using a silk screen to print and there is a lot of "open space" on your screen (as in lots of blue being printed) you'll use the pigment up quite quickly. But if you're printing with wood blocks or lino cuts, and the design is relatively fine, the paste will stretch very far. So it really could be anywhere from 1-6 metres, but a good average would be that it's possible to print around 2-3 metres.
The other additives in the kit, which are used to fix the dye and reduce the indigo, are used to make a bath in which you soak your printed fibres.  If you manage to print a lot of yardage, you can re-use the additive baths over and over until all of your pieces have been through them.