How long will this memory foam mattress last?

It is durable for its class, scoring 7.9. It uses genuine high-density memory foam, a real 3 lb density grade rather than the lightweight foam that sags early in budget beds, over a dense support core with no coils to fatigue. At only 8 inches there is less total material than a thick premium build, so it is honestly durable for an affordable boxed bed. A protector and quarterly rotation extend its life; a 10-year warranty backs it.