"edit: Now I am reading his blog more closely and he only started posting his answers in December. He started reading SICP in July" well, he didn't do too much

"edit: Now I am reading his blog more closely and he only started posting his answers in December. He started reading SICP in July" well, he didn't do too much for the first 3 or so months. so he really got down to work around September iirc.