For my solo EOLs it came on the run up to FHT (1976) after some 75 hrs Whirlwind time - I was obviously much slower off the mark, and I didn't mark the exercise numbers down either! However, the confidence it gave you as a student was immense (and probably quite misguided); I do however still think they are the best exercise to practice - and I have had to use it for real, albeit in a twin engine machine.