Wait a minute,if you fasting for 18 hrs a day,that means 18/24 hrs.It means the only time you have left without fasting is actually 6 hrs.In this 6 hrs,where does Isha prayers,Taraweeh prayers,Fajr prayers fit in?When do you sleep?Because Iftaar is at Maghrib time,Isha must be very close after that.I don't know how you can still fit in other prayers.This time zone is hectic without Ramadaan, what more in Ramadaan where you may have to pray Taraweeh too.