Until the player track for the song is constructed (new track each time you hit play)
the length (time) is unknown to the player.
You can quickly learn the track length by hitting play and as soon as the count-in begins, bring up the player controls and hit pause (was the play button).
Then read the “time remaining”. Not elegant but that’s how it works. Though it might be useful to adjust the tempo and immediately see the track length, the track hasn’t been constructed yet…
That’s actually a “feature”. Instead of a repeating identical track, each new track varies a little each time just like real musicians at a jam session.
)BOB