Probably just time. If we assume that the time frame for all of this was 30 years, this means that he completed one of this projects aprox. every 3 years. This does not look that exceptional to me. The question is, what else he did during this time. In order to assess his work efficiency, we would need to know how many hours he really had to spend on this projects.
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Probably just time. If we assume that the time frame for all of this was 30 years, this means that he completed one of this projects aprox. every 3 years. This does not look that exceptional to me. The question is, what else he did during this time. In order to assess his work efficiency, we would need to know how many hours he really had to spend on this projects.