Check cron job run times?

Is there a way to check how long a cron job is running for? We suspect one isn't behaving because we are suddenly getting occasional lag spikes of up to 2 minutes every now and then, but there are many that run concurrently. They don't seem to be consistent with user activity which is why I suspect a background task.

How can we see stats based on how long each one runs for? Is there a log anywhere we can review?

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