There's a great deal of power in '.', which repeats the last command. So if you have to do something 12 times, your steps could look something like this;

- Run the command once

- Think "Hmm, looks like I have to do this about ten more times"

- Type '10.', repeating the last command 10 times

- See that there's only one left to do, since you guessed 10 and it was 11

- Press '.' one more time to do the last one

You won't win any vim golf competitions like that, but it's very easy to do.