It honestly depends on how I'm using my phone on a given day. If I'm at work and it's a busy day, I essentially don't touch my phone, except to reply to the occassional text message. On less busy days, I'll stream Spotify, use iMessage, check email, Instagram, etc. I do have a USB cable in my car which I connect to my 6 each time I'm driving to steam Spotify through my car speakers. But typically I'm left with around 20% at the end of the day and usually connect it to the charger each night before I go to bed.