No year has 51 Thursdays. A year has either 52 or 53 Thursdays. Normally it has 52 Thursdays. If it starts on a Thursday or a leap year starts on a Wednesday, there are 53 Thursdays in the year.
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A year can have 53 Thursdays if January 1st falls on a Thursday and it is a leap year. This occurs once every 11 years in the Gregorian calendar. The most recent years with 53 Thursdays were 2009 and 2015, and the next will be in 2026.
about 5 years :)
That depends on what day the year starts. If it starts on a Thursday, there are 53 Thursdays. If it starts on any other day of the week, there are 52 Thursdays.
If the year is 2010. Then take 2010-51. This takes you to 1959.
18627 or 18628 days, depending on the incidence of leap years. It is possible to have 18626 days if you have a non-leap-year century.