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well it depends on what your doing but if you can lose about 5 pounds in 2 days.
It depends on the diet one is taking. It takes about 1 month to lose 5 kg.
2 kilograms = 70.5479239 ounces
That is a very bad idea, because after those 3 days you will eat again, so there's no point. In a week (if you don't eat anything) you'll probably lose 2 kg. You will regain the weight once you start to eat again.
2 394.96771 kilograms ===
if your child is very fat then it will take 728days
It will lose 42 seconds in 7 days.
You need to develop a dietary plan and work out in the gym to lose 10 kilograms in two weeks.
There are 1000000 milligrams in a kilo. therefore, there are 2,000,000 milligrams in 2 kilograms.
5487 pounds = 2 488.86133 kilograms
I'm no expert, but that sounds pretty crazy. From what I know, it takes at least 2 weeks (not days) to begin to lose muscle mass. So to formally answer your question, NO you cannot lose 30% muscle mass in 2 days!
To lose kilograms would be needing to eat healthy food instead of junk food, exercise, and drink more water.