You can verify your holdings in advance anytime before selling them. This will ensure there is no delay when you want to sell your stocks. This verification is valid for 1 day. However, if you are generating a new TPIN by CDSL, the verification might take upto 6 minutes. The TPIN is reusable. Hence we recommend you to use the last generated TPIN for a faster experience. You can find your BOID in Profile Section --> Account Details