I don't remember exactly how fast - but significant. Try it for a day and see if it works for you.
I want to say it ate like 40% or so within a few hours. The issue is always having microphone listening for the wake command - burns a lot of juice.
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You have to fish your phone out of your pocket in order to use s-voice or google now to make a phone call. At that point it's easier and faster to use your finger.
How do you do it? Don't you have a problem with pocket dialing terminating the process? Is it a third party app? Just tried google now--it cut out in the middle of it's instruction about saying ok or cancel to complete the call. Must have pocket dialed cancel. I had a little better success on the pocket dialing front with s-voice, but with the new update, you have to say hi galaxy each time you want a voice command prompt, makes it basically unusable.