In that case it's closer to 50 bytes I think. (Average wrong line length is 105k, as first line is 210k and last line is 0k, so number of lines is 450M / 105k

In that case it's closer to 50 bytes I think. (Average wrong line length is 105k, as first line is 210k and last line is 0k, so number of lines is 450M / 105k (about 4300), so lines would be 210 / 4.3 = about 50 bytes.)