TBW, I think means terabytes written.
Each ssd nand block will have a limited number of read/rewrite cycles.
It used to be a factor when a ssd was 40gb. Now with 1tb drives you need to be in a high activity server environment to be concerned about endurance.
These drives will be long obsolete before they wear out.
Think 15 years.
TYpical use is roughly 12 Terrabytes written in ~2 years...; that being the case, event he EVO ought to last most folks for 10 years easily, making twice the TBW (Terrabytes written) levels of durability merely niceties...