Hi i had no tirebreaker at my raid directly to 5 mins left and duration of this was very short for raids i’ve been before.
Tiebreaker depends on the number of turns you have played, not on the timer.
So it’s possible to have the 5 minutes warning but no tiebreaker at all.
You can easily try this by entering a raid, making your first move and then just wait. The timer will appear but you won’t have tiebreaker.
And you can also try the opposite. Enter a battle against a weak opponent with your team full of healers for sustain, just move tiles as fast as you can, and the tiebreaker will appear before the 5 minutes warning.