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The motor provides energy at the rate of 7500 Joules each second.

The energy needed to raise the piano = mass of the piano x acceleration due to gravity x height = 500 x 9.81 x 1000 = 4.905 x 106 Joules

time taken = 4.905 x 106 / 7500 = 654 seconds

So, it would take around 11 minutes.

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Q: How long would it take a 7.5 kW motor to raise a 500 kg piano to an apartment window 1000 meters above the ground?
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