How long are games with increment?

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TheChessVacuum

Hi. One thing that I've always wondered is how long can games go if they have increment. For example, how long could a 15 + 10 second increment game or a 30 + 30 second increment game go? Is there an easy formula for calculating approximately how long these games could take?

ESP-918

1 game lasts 40 moves in general , you can calculate an approximate time.