1. Time has gone by so quickly
2. When I'm with my brother, time goes by so quickly even if I spend a few hours, I don't realize that.
1. It's fine. 2.
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1. It's fine.
2. This should be two sentences, and I would phrase it a bit differently: When I'm with my brother, time goes by so quickly. Even if I spend a few hours with him, I don't realize it.