First off, the actual hard work was done entirely by ninewheels0 on IMDB, who compiled the original list at http://www.imdb.com/list/ls076752033/. I cannot begin to fathom how long that took him/her, and he/she deserves all the credit. Please give the list a “Like” on that page, and if you do use this dataset, please link to ninewheels0’s original list and credit as such.
Secondly, the screentime value is in minutes with fractional seconds (i.e., 1.5 means “one minute, thirty seconds,” not “one minute, fifty seconds”).