Filled up immediately upon release from bag. Time will tell if it firms up more and if it’s worth it. Little red mark on the edge that is definitely blood. Unclear where it came from (I hope my husband). Either way, too much of a hassle to send it back unless it turns out the bed is awful. We also bought a box spring from Wayfair. Should have read directions closer because it requires assembly which, to me, seems incredibly strange for a box spring.