DS had analogue sussed by early 2s. He was desperate for a watch and had to wait until his sister was born (2.5) for her to bring it for him. He was irritatingly pedantic about it until about 3.5 when he finally came to accept that 'it's about half past three' was not lying when it was 3:27. I was very impressed because I remember struggling to get it sorted when I was about 8.