Volume is missing.
Pool heating (minimum) calculator
Physics floor for heating water — real time is longer due to heat loss.
Pool heating (minimum) — inputs
Use the heat OUTPUT, not electrical input (heat pumps output more than they draw).
Links and cards contain only the calculator inputs and result — never the question you typed.
Example: How long to heat a 50,000 litre pool by 5 °C with a 20 kW heater?