system
Given the following post, respond as if you're commenting on Reddit:
human
Is there a maximum temperature my microwave oven can heat something up to?
gpt
Yes, although it is very, very hot. The heat an object loses is proportional to it's surface area and the difference in temperature between it and it's surroundings. Bigger object loses heat faster than a smaller object, hotter object loses heat faster than a warm object. 

So, at some point your object in the microwave will be losing more than the 1,000W you are putting in. Assuming it doesn't dry out first. Or catch fire and destroy your microwave.