Why I cant log in to my Telegram account?
There is no issue if you logged out from all the devices, you can log in into your account again by simply entering your registered phone number. When you type your contact number in it then the OTP(one time password) is send to your number by SMS.
How long is Telegram too many attempts?
Too many attempts occurs after excessive login attempts (for security purposes). It takes about 24 hours for the temporary lockout to clear, after which you can log in again normally.