what happens to a cron if its not complete and next iteration is due

I know I am asking something and not code related issue but before implementing my cron I wanted to ensure that I know what to expect from the execution.

I have a cron that delivers 125 emails every 2 minutes and I wanted to know if something happens and the cron is not complete by the time the next iteration is due.

sending an average of 125 emails every 2 minutes is very important and I would prefer a solution which will ensure that backlog is cleared whenever possible.

Any advise is highly appreciated.

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