If i.....How long should it take me to shed 30 lbs?

ok im 150 lbs and 5'5...i dont look really fat but i wanna be skinny,if i eat 500 calories a day and exercize 30-60 minutes a day,how long should it take me to lose 30 lbs????If you think this is unhealthy guess what!i dont care so you dont hafta tell me that but thank you to those that actually answer my question:D