"You will hear about me in a few years!"

Translation: Tu vas entendre parler de moi dans quelques années !

[LSadun]

I thought that lengths of time were ans rather than annees. Why are we using annees here?

[Lucien660983]

It's not really about lengths as much as about numbers. If there's a number, it's usually "ans", but after "quelques" or "plusieurs" for example, it will be "années".