Of course everybody's different, but I notice most people will notice something in about 2-3 weeks.

I have lost 26 pounds and even my doctor didn't say anything. haha

2 weeks or more

I agree with most of the numbers above ... when you lose 10% of your total body weight, it's noticeable ... both in your blood work numbers and what people see.
If you are 200 lbs, people notice 20 ..... if you are 300 lbs, people notice 30.

People often see the early fat loss in your face!

Three weeks to a month !

From three weeks to a month, the change can be noticeable by those around you. But you must continue because at that moment nothing is won yet!