The answer you write are not get upvote on based on length but musing upvote on basis of proper content. Musing is upvoting on seeing the content of the answer and also if should be related to question only. If you have written answer in good length and also in good form but it is not related to question then also you will not get upvote.

The better you write answer with good words and content related to question you get upvotes by musing.