Users carrying out more than 1,000 searches for vaccine slots or those generating more than 50 OTPs in a span of 24 hours will be blocked from CoWin. Providing this information, an official with the portal management team told TOI on Wednesday that users (via their mobile phone numbers used to register) will be blocked for 24 hours.Users carrying out more than 1,000 searches for vaccine slots or those generating more than 50 OTPs in a span of 24 hours will be blocked from CoWin. Providing this information, an official with the portal management team told TOI on Wednesday that users (via their mobile phone numbers used to register) will be blocked for 24 hours.