I think saying rich would be taking it too far, rich would implied that you can easily lived without working for a decades with what you have in the bank, that would be my definition.
If you had asked the 25 year old archaeologist me ten years ago, he would have said it meant "rich". But that guy lived with his mother in law (and his wife, he wasn't a total weirdo) and had near enough zero regular outgoings.
I think saying rich would be taking it too far, rich would implied that you can easily lived without working for a decades with what you have in the bank, that would be my definition.