What is the worst time case for Arduino Mega? I'm going to implement home automation using an Arduino Mega with 8*6=48 channels relay in my new home. I have prepared an Android app for an HC-05 Bluetooth controller. How much time can I keep running an Arduino Mega with all the appliances in a home? Can I keep it working 24/7 for a while?
Yes.  

(For better guidance than that, we'd need to know more.)