Posted: 2021-12-30 00:26
The speed is here character speed/ effective speed. It gives you more time to react on a received character. Do not go to 25 because 25/25 (real Morse code, examination speed of professional telegraphers in the past3) is not the purpose of this website, but a beginners speed of 13/13 in the case you finish lesson 40 with 20/10, or 9/9 in the case you finish the course faster with 20/5.
Do it with 20/10 or 20/5 with less chance on failure and hence wasted time. dont bother about counting.