Judging your battery life by the time remaining indicator is like judging your car's economy by a live MPG counter - if you're flooring it, it'll say 10 MPG, if you're coasting it'll say 100. You best bet is just to use it, and once it gets to the final couple of percent, open Activity Monitor and check the time on battery under the Energy tab. Note this includes standby time, but is a decent approximation.
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Case in point: my 'coasting' 13" Touch Bar just indicated 18 and a half hours remaining at 94% charge!