I’d argue that having them be 30 or 40 years would even be fine. An author who starts in their 20’s should reasonably expect to keep profiting off of their early work until they retire in their 50’s or 60’s. But the current state of copyright is just asinine, because it is basically written by and for corporations.
Or just get a GLi.Net router, and get the OpenWRT firmware right out of the box without even needing to flash it manually.
As a bonus, if you ever have the need for one, they also have some badass travel routers that can use your phone as a modem, take a SIM card natively, or just connect to an Ethernet/public WiFi to create your own secure network. Super handy if you do a lot of traveling, because they can be used in hotels or cruise ships. Know how cruise ships sell internet access per device? Yeah, your travel router only counts as one device. Set that bad boy up, and now all of your devices have internet.