Not only is that question too vague to answer as all organisms have very different life spans, the way you worded your question makes it incredibly hard to read.
The length of time an organism is expected to live is their lifespan.
The length of time an organism is expected to live is their lifespan.
The length of time an organism is expected to live is their lifespan.
The length of time an organism is expected to live is called their lifespan.
The term that refers to the length of time an organism is expected to live is the life span.
The term that refers to the length of time an organism is expected to live is the life span.
The length of time a is called that an orginism is experctd to live is ab stimulus
Lifespan
life span
Life expectancy
The length of time an organism is expected to survive varies greatly depending on the species. Some species have very short lifespans (e.g., fruit flies live only a few weeks) while others may live for many decades or even centuries (e.g., some species of trees or tortoises). Factors such as environment, genetic makeup, and predation all play a role in determining an organism's lifespan.
The durability of a piece of equipment - is the length of time it's expected to function before it fails.