Why? If you're only running the equipment 8 hours per day it will take 3 time longer to ROI.
Consider the trucking expression: "If the wheels aren't turning, the truck isn't earning".
Same thing here, if you're spending a lot of money on equipment you want it running 24/7.
well the answer is simple . for 8 hours the electricity is FREE
for the remaining of the 24h i pay the electricity like everybody else (since i dont have batteries as i mentioned above)
thats why i want to mine during daytime
You missed the point. What's to be gained by doing it at all if you only run the miners 1/3 of the time?