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Hi David,
How high.!?!.. Hmmm that's a very relative term. It will depend on how good your eyes and how well you can pick it up in twilight skies. Sun will just be setting. At ~7:45pm it will be about 6° above the horizon!! Pretty low. The only advantage to this viewing is that the moon provides a good pointer in terms of direction and height. Get to a clear horizon if you can and use binos. Telescope will help to resolve the disk, but you haven't much time as it'll set fast!. It'll be good just to say you've seen Mercury!
Cheers
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