I don't think the running time of the proper album is 69:51. Even though summing up the given tracklist song length can give that number. Each tracklist song length could be rounded down and does not give how many milliseconds each song takes. So there is still a possibility that each track would sum up to 70 minutes if we consider and sum up the milliseconds of each track.

I don't think we should give an exact length for the official proper album just yet until it is released, we could give range or an estimate of its length. The minimum possible length of the album is 69:51 and the maximum could be 70:00 (the continuous mix length).