Question about Sigma 24-70mm f/2.8 DG DN Art

I have had the lens for about 2.5 months now. People keep reading that the lens attracts a lot of dust. But so far I haven't had a single speck of dust in it, even though I've used it a lot. In Switzerland, you also get the black Sigma warranty card with the lens, which gives you a lifetime warranty and an annual free cleaning. So if dust does get in, you can have it removed once a year for free.