What is the speed of slow mo video vs Real time on an IPhone 5s?

I filmed a physics experiment in slow motion so that I could get an accurate measurement of time, but I'm not sure how to convert the time taken in Slow motion to real time. For example, if something takes 4s to fall when recorded in slow motion, what should I divide/multiply that by to get the value in real time?

Do the same video in slo mo and real time to figure it out. (Use the exact same video.)

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