How do you determine how long your film is? I'm looking for the official industry standard practice. Do you start at the first production company logo, do you stop after the end credits? Do you round up or down to get to the even minute?
From watching a few hundred DVDs with the timer running, films begin when distributor logo begins rolling and end when credits stop.
To the best of my knowledge, this is correct.
When rounding, I follow the rules of math.
argg.. there are no rounding rules in math, its what ever teacher wanted. The whole point of math is to be exact! Rounding is for humans only.