Reluctant to review, how do you put a star rating to someone’s personal notes on their days. However I both enjoyed and didn’t enjoy the fact it was usually just a sentence about what happened on a day. It being short and spanning such a long timeframe gave a real idea on Alan’s rich life and sometimes a brief insight to his thoughts/feelings. However it also read quite disjointed, no substance to grab on to and get in to. 
Alan lived a very full interesting life and it’s nice to have the insight. As something to read I did find it dragging.