In terms of an async function waiting for an async callback, how do you express the durations of their lifetimes in relation to each other?

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In general, the lifetime of an async function is dependent on the lifetime of the async callback it is waiting for. The async function will start executing, and when it encounters the callback, it will "pause" its execution and wait for the callback to complete before resuming.

The duration of the async callback's lifetime will depend on the operation it is performing. For example, if the async callback is fetching data from a remote server, its lifetime will depend on the time it takes for the server to respond. Once the callback completes, the async function will resume its execution.

So, in summary, the async function and async callback have lifetimes that are interdependent. The async function will "wait" for the async callback to complete before proceeding, and the duration of the async callback's lifetime will depend on the operation it is performing.