If a lambda extension executes longer than the lambda execution, is it counted towards the duration of the lambda and against reserved concurrency?

Question

For eg., if I have a lambda with 5 reserved concurrency and a lambda extension that runs twice as long as the lambda that takes X ms to execute, will the overall execution time be 2X ms? If I have 5 concurrent lambdas that start at the exact same time, will 2X ms (and not X ms) have to elapse before another lambda executes?

And would this apply to both internal and external extensions?

Answer

Lambda extensions count as the duration and also for concurrency. You should assume it is just as if it was part of the function itself.

If a lambda extension executes longer than the lambda execution, is it counted towards the duration of the lambda and against reserved concurrency?

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