500
You are a great artist, and you want to explain to your parents how many pictures you have drawn in school this year. You say...
I have -------------- 17 pictures this year! I have ------------ 3 hours every day!
I have drawn 17 pictures this year! I have been drawing 3 hours every day.
In the first sentence, the emphasis is on how many pictures you have completed. In the second sentence, the emphasis is on the amount of time you have spent drawing.