Definition:

Duration is a measure of time that refers to the length of time elapsed between two events or points in time. It is typically measured in units such as seconds, minutes, hours, days, weeks, months, or years.

Formula:

Duration = Time elapsed between two events

Units:

• Seconds (s)
• Minutes (min)
• Hours (h)
• Days (d)
• Weeks (w)
• Months (m)
• Years (y)

Examples:

• The duration of a movie is 2 hours and 30 minutes.
• The duration of a phone call is 15 minutes.
• The duration of a journey is 4 hours and 30 minutes.

Factors Affecting Duration:

• Speed of travel
• Distance traveled
• Number of stops
• Traffic conditions
• Weather
• Personal factors (e.g., age, health, fatigue)

Applications:

• Calculating time intervals
• Measuring elapsed time
• Scheduling events
• Estimating travel time
• Determining the duration of activities

Additional Notes:

• Duration can be abbreviated as “dur.”
• The duration of an event or activity is typically measured from the start to the end, including any intervening time.
• The duration of a time interval is always positive.
• Duration can be expressed in fractional units, such as 30 minutes for 0.5 hours.