Episode.32 1時間も勉強した？1時間しか勉強してない？How can you put your value on a quantity of something?

昨日1時間も勉強した。昨日1時間しか勉強してない。The first sentence is an affirmative sentence. Whereas the second one is a negative sentence. Do you think they mean the opposite? Let’s get into the difference and you can articulate yourself more!