Idiom: talk a mile a minute
To speak in a very quick or hurried manner; to talk very fast.
To speak quickly or excessively.
When the boss gets excited, she starts talking a mile a minute, and I can never follow everything she’s trying to say!
Mike was very excited, talking a mile a minute.
The two of them were talking a mile a minute.
They spent the whole visit talking a mile a minute and then went home and phoned each other!
She was talking a mile a minute about the accident.
This expression, alluding to the literal speed of 60 miles per hour, dates from the mid-1900s, when that speed was considered very fast, but it has survived into times of much greater velocity.