Can a person drink 3/4 of a jack daniels in a cpuple hours?

Had a friend come over a while back. I honestly think he's got a drinking problem these days. I had a fairly large sized bottle of jack Daniel's and when he left the bottle was empty for the most part. I think he was just drinking straight out of the bottle not even mixing it. Honestly, I don't drink but do keep some alchohol on hand for girls and any friends that come over. Anyways, that's not normal to be able to drink that much in a 2hr time frame and still be functional unless you have a drinking problem, right?

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Is this why he's been pissed off at me for totally irrational reasons? We haven't hung out in about a year now. Finally got tired of his bs, but I remembered about a year ago he drank most of that bottle and that was kind of the start of his odd behavior. I was just pissed he drank the whole bottle, but it didn't really dawn on me at the time.
Can a person drink 3/4 of a jack daniels in a cpuple hours?
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