Political watchers have at least, in my memory, taken a keen interest in the first 100 days of any new Administration. The first I can recall was JFK's in 1960 where his inauguration speech set out his hopes, dreams and aspirations for the free world aka the United States of America.
Blair had a 100 Days in 1997 but not in 2001 or 2005. Brown, having copied much of JFK, including writing a book on Courage, had his 100 days taken away from him by what Macmillan called "Events, Dear Boy"...