When composing songs, I always see to it they're not too long.
The structure of my songs usually is:
intro
verse (2x)
(pre chorus, not necessarily)
chorus
verse (2x, sometimes 1x)
(pre chorus, not necessarily)
chorus
bridge (not necessarily)
chorus (2 or 3 times)
Another chorus added to this structure requires another verse also , so it would be like this
(see green)
intro
verse (2x)
(pre chorus, not necessarily)
chorus
verse (2x, sometimes 1x)
(pre chorus, not necessarily)
chorus
verse (1 or 2x)
chorus
bridge (not necessarily)
chorus (2 or 3 times)
and that added just makes the song last too long in my view.