Meaning

• An amount of time or a particular time interval.

• (in the singular, not followed by "of") The time taken for the current situation to end, especially the current war

  "Rationing will last at least for the duration."

• A measure of the sensitivity of the price of a financial asset to changes in interest rates, computed for a simple bond as a weighted average of the maturities of the interest and principal payments associated with it.