Sorry, title formatting scripts do not get access to information which requires processing the entire playlist. You will notice that the Default (and I think also Columns) UI module(s) have optional status bar displays for both total time and volume. The total time display will count either the current selection, or the current playlist. Either optional display may be enabled by activating the status bar's context menu, usually with a right click.
Then why are you using Columns UI?
I'm using a costume Default user interface, that has a Playback state display formatting fields for editionhere is where I want to add the time lapse display for the entire playlist but I don't have the know how!!!
Sorry, title formatting scripts do not get access to information which requires processing the entire playlist.
Formatting information from multiple tracks into a single track display line will never be available, at least not for the playlist. Nobody wants O(n^2) going on there.
So showing the total time of a playlist or the remaining time of a playlist will never be available !!!