That’s assuming your interest rate is higher than inflation, which it typically is not. Even when it is, like (debatably) now, it’s not that much higher. Over time, you’re losing money without spending a cent.

Now, if you invest in some ETFs you might be able to keep going for a while, but there’s the chance that the market crashes and stays down long enough that you run out. That’s pretty unlikely though, especially if you get a few good years to grow that egg before any crash happens.

It wouldn’t be that difficult to live off that investment, but a savings account and interest would not suffice.