Yes, you need 1-4 keypresses per char, but the language itself is significantly more compressed than English. The equivalent of an English word is 1 to 2 chars (with more frequent words usually being one character - just as frequent English words tend to be shorter), but the number of "words" you use to express the same idea is generally fewer, primarily because the language is a lot more ambiguous than English (e.g., there is no 'the', 'a', or 'an', and subjects are often dropped - it is left to the speakers to fill in the blanks from context).