The only way your claim of "as little work I can do" is accurate is that if you spent one minute less working, it becomes the trigger point where you'll get fired.

But it sounds like you're just a normal corporate worker who does exactly what is stated in your employment contract and no more (and no less) -- but I suppose you should know that there are many people who do much less work than is formally required and get to keep their job.

There is a pain threshold for most managers to fire an employee. They have to spend time and money on recruiting and training a new replacement, so in theory if the cost of you slacking off is lower than the cost of finding a replacement, they might not actually fire you.