We’ve had a Zojirushi brand rice cooker for a long time and it has provided good service. It cooks the rice and then will keep it warm until you get to it. The other day I set it to cook a cup of basmati rice while I was cleaning up from dinner, intending to let the rice cool in the fridge overnight for this dish. I forgot about it until sometime the next day. The timer window told me that it had been dutifully keeping it warm for 16 hours. The rice was fine, maybe a bit more clumping than usual.