It takes a top athlete in our world to run 800m in under 2 minutes, it would probably take another 30 seconds to run an extra 200m for them. Now think about this, this is a simulator, where you are an average person, most likely without any physical training, running with a bunch of gear. I think 1000m in 3 and a half minutes is reasonable. Besides, if you had an auto-run key, you'd most likely be popped off by somebody while you were doing something else.