What do you think,
How safe is to keep some BTC in the coldwallet for 20 years paying no attention to crypto world?
There are some condition you should aware
1. Every software will have an update, you can not save and forget your wallet. This will be a problem when bitcoin blockchain have a hardfork or any critical update
2. Every hardware also need an update, when bitcoin have critical update so hardware will follow it, your firmware also need to update regularly
3. Sometime, if your wallet not updated it will make you lost your coin, atleast you have to read regularlyupdate
I strongly second that
Even if you keep Bitcointalk page open in your browser for some time and then try to submit a post, the site will complain that your session has already expired and you have to resubmit it. So in twenty year time you may not be able to access your coins right away or, maybe, even altogether due to hard forks or similar things (provided you are still alive by that time). Apart from that, twenty years is a looong time in and of itself, and while chronologically it may in fact be a quarter of your life (or even less than that), it may still be the best part of it