Right now i have 1 day, 4 hours on my battery, currently at 60%. The Display, taking 24% battery, has been on at 25% brightness for 4 hours. Ive had 40 mins of Voice calls taking 22% battery.
So if voice calls for 40 mins take up 1/5 of battery, then my phone gets 40 * 5 = 200 minutes = 3.3...