Why does bitcoin mining take so long?

Why does bitcoin mining take so long?

I was wondering that a block (Here's a Block #506398)

It's nonce is 1,229,291,212 (A little over a billion), Then why does it take so long to mine a block because my system alone can do about 500 GH/s (500,000,000,000 Hashs per second), Which is very little in comparison to what an ASICs can do.

Then why does it take so long to mine a Block??

Thanks for your help!!

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