How many days is the verification by TPIN valid for?

Once verified, the approval using TPIN by CDSL is valid for 1 day from the date of verification. Once this expires, you will be required to verify your holdings again to be able to sell stocks. If you buy new stocks during this time, you will have to verify them again (not for intraday orders). You can read a blog about it here You can find your BOID in the Profile Section --> Account Details (16-digit number)