A very, very, very long time.
How many years? We need a big number. A billion is 1000000000, a 1 with 9 zeros after it. A googol is a number with 100 zeros after the 1. A googolplex is a number with a googol amount of zeros after the 1. Too small. The mathematicians invented the "Graham number" which the Guinness World Records listed as the "World Champion largest number". It is too large to be written in scientific notation because even the digits in the exponent would exceed the number of atoms in the observable universe. Well, even this is much, much, much too small a number of years. We're not talking about shuffling a deck of cards or the sand pebbles of a beach. We're talking about shuffling the position and motion of every atom in the universe. However, eventually there is an incredibly large finite number of years when "the music box repeats it's tune".
This is a long time to wait. To handle the wait the universe gives us the "magic of death".
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