How much does the temperature decrease?



I have 3000L hot water 90 Celcius in a tank cap. 4000L. I put 50 mm thick Rockwool blanket insulation (thermal conductivity is 0.034 W/m.K) around the tank. How much is the water temperature will I get in 24 hours?
I have 3000L hot water 90 Celcius in a tank cap. 4000L. I put 50 mm [...]