How many days are there in 2 AND A HALF years?

Answer 1

Either 913 or 914 depending on whether one of the years is a leap year.

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If none of the years is a leap year:

1 year = 365 days

→ 2½ years = 2½ × 365 = 912½ days

which could be rounded to 913 days if you count the half day as a whole day though it would then be a tad over 2½ years.

If one of the years is a leap year, the extra day could be in one of the whole years:

→ 366 days + 1½ × 365 days = 913½ days

which could be rounded to 914 days if you count the half day as a whole day, though it would then be a tad over 2½ years.

If the last year, the half year, is a leap year:

→ 2 × 365 + ½ × 366 = 913 days.

If we use a general year as 365¼ days:

→ 365¼ × 2½ = 913⅛ days

→ 2½ years is 912½, 913, 913⅛ or 913½ days depending upon which, if any of the years is a leap year, or a ¼ day is used for a general year.

The best estimate for 2½ years is 913 days.