Not sure about that.  We had initially 4 hours a day learning, then increasing speed.   An additional 4 hours spent getting typing speed up to 25 or so wpm.  That was all with 5 letter and then number groups.  Since I went in, having dome code knowledge, and was a high school  champion typist (120 wpm) I had also asked in a question period " what happens is you do not pass the required 5 wpm in the first two weeks "  the answer was "We will give you a different job ---- cook, security guard, poleman."  I went  back in and passed t wpm in the next 15 minutes minutes.

I also passed typing on that afternoon's session.  I no longer had to take typing. So wound up in CW all day long.  Consequently passed one speed after another in a month till they ran out of speed tapes. (1960).  Left me a lot of free time studying frequency, antennas, formats, etc.  And came out as number 2 in a class of about 125.  The guy who was first had been a ham since about age 12.  Soooo I taught CW to kids and adults for many years, using hand key and sessions of about an hour weekly.