characters are like letters, punctuation marks, spaces, numbers etc. in chinese it could also mean each separate character but you know ;) But don't confuse characters with words. Something with 40-140 characters is really little!
You're allowed 140 characters with or without a link.
4000 characters is approximately 500 words.
To convert net keystrokes into words per minute (WPM), you typically divide the total keystrokes by an average word length, often estimated at 5 characters per word, including spaces and punctuation. For 140 net keystrokes, this results in 140 ÷ 5 = 28 words. If this typing took one minute, that would equal 28 WPM.
about 140
740
not very many...
3000 Characters is averaged between 2,000 words to 2,980 words.(allwordphone.com/count-words-characters.htm)
not very many...
740
Average is 2-3 words a second, so around 140 words.
That will depend on the words. However, in typing for measuring speed, a word is considered to be 5 characters.