To calculate how many days are in 4 years, you need to consider whether those years include leap years.

• A common year has 365 days.
• A leap year has 366 days (occurs every 4 years, generally).

Typical Calculation:

• 4 years usually include 1 leap year and 3 common years.
• So, total days = (3 × 365) + (1 × 366) = 1095 + 366 = 1461 days

Summary:

• 4 years = 1461 days (if one of the years is a leap year)
• If no leap year is included (rare), then 4 × 365 = 1460 days

Let me know if you want the calculation for a specific 4-year period!