I bought a ASUS CXB170CKA-212.BCLN6 Chromebook in March 2022 (for USD150; it's not a high-end model). According to ASUS, "The Chrome OS AUE(Auto Update Expiration) date [for this model] is June 2029."[0]

I consider 7 years to be many more than "a few years".

[0] https://www.bestbuy.com/site/questions/asus-17-3-chromebook-...