You didn't read any of my posts did you?
The world Hindustan was first used by the Mughals, so you can use the Mughal map to determine the length and breath of Hindustan.
They called themselves the "Emperor of Hindustan". Here is the map of the Mughal Empire when it was at its largest.
Does that look like the "land of the SIndhu" or the "land of the Hindu" ?
BTW the Chinese called the land "Hein tu" in 1st century BC. Why is that ?