Pasarán de cinco a diez años antes que la tecnología esté lista.

What about this sentence triggers the subjunctive? There is only slight doubt/uncertainty in the sentence and it’s passive. There are no doubt words like dudar, pensar, creer, negar.

In this case antes (de) que is the trigger. :gun:

Why does this phrase trigger the subjunctive? Because the subjunctive is also used to indicate the uncertainly of future events.