I can't believe there is not a more precise measure of time in larger playlists.
Currently spotify will measure the time up to the nearest hour increment. For example a playlist containing songs adding up to 1 hour 30 mins will still only display as 1 hour, until such time as more tracks are added and it becomes 2 hours. Likewise for a day format, it could be 1 day 14 hours but will still read 1 day. WAY OFF.
It would be SIMPLE to change to a reading of XX Days HH:MM:SS for example.