How long before a new job stops feeling like you're one mistake away from being found out?

Four months into the new job and I still catch myself bracing for someone to point out I don't actually know what I'm doing. Wins keep happening, positive feedback keeps coming, and the feeling hasn't budged much. Not looking for reassurance so much as an actual timeline, for people who've been through this, when did it actually let up, or does it just get quieter with rank instead of going away?