I like to take my leftover rice, chicken, and veggies, and stir-fry everything in the morning, then pack it into bentos. If everything is bite-sized when put away the night before, it's a 5-minute process in the morning, and makes for an amazing lunch, with none of the icky-leftover-rice taste or mouthfeel. And, personally, I like fried rice hot, warm, cold, however I can get it, so it's fine right away or after a couple of hours for lunch.