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I’m currently getting about 6-7 hours with heavy use. But as with all iPhones it takes a week or so of charge/discharge to get a real reading on how long the battery lasts.
 
Battery life has been great thus far however I find that to be typical with a new phone and fresh install.
 

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This was my usage at 1% remaining. Around 1 hour better than my 2 year old iPhone 6S Plus.
 

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Compared to my 7 I'm getting very impressive results. I'm not a heavy user in that I don't play a lot of games on it, I don't stream a huge amount of content either (IMO). Everyone's results and usage will vary, but for me, as a reference, I used to only just make it through the day (sometimes needing a top up towards the end of the day) and get between 5-7 hours of usage.

Obviously I have been using the iPhone X a lot more than I usually would because shiny, but Saturday and Sunday, when I was using the thing none-stop, it survived the day. Yesterday I got about 15 hours stand-by with 9 hours of usage and was on around 9% when I put it on charge for the night. I'll be interested to see todays results now that I'm at work and should return to somewhat normal usage for me.
 
how someone uses their device matters a whole lot. I'm not the best person to ask as I don't use my phone for demanding tasks. Considering what I use it for, I think the battery life is still above average and above what I was expecting.
 
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