When your heart is broken and you feel so much hurt inside how long does it take before the pain goes away?

No one can say exactly, for definite, because it will differ in different people.
I would suggest perhaps you take a listen to a poignant song or two, on this theme, such as the Bee Gees 1971 song "How Can You Mend A Broken Heart?", --which was even more poignantly covered by that great soul Master, Al Green, and is available on Youtube.

It can take a long time but an easy way to get over the broken heart is moving on try to find someone who is worthy of ur love

Depends on who it is & how much you loved/ loved them .

Listen to the Cocteau Twins or The Smiths and that should put things in perspective with their lyrics and songs.

You have to undergo the natural process - denial - acceptance - moving on. How long from denial to moving on? It will greatly depends on the person suffering. The important thing to know is - moving on will happen, you will get there eventually.