There are various disadvantages to having long fingernails; they are enumerated in an article on the Community Magazine website. But the article also states:
The Magen Avraham says that one should cut his nails only on Friday or Erev Yom Tov.
You neglected to cut your fingernails last Friday. Now it is midweek, and they are too long. Should you cut them before Friday, or should you wait until Friday?
 R' Daniel D. Levy (January 2013). "The top 10 questions & answers on customs and laws of fingernails". <http://www.communitym.com/article.asp?article_id=102762>. Community Magazine 12 (4): 60; s.v. "Is it permissible to grow long fingernails" and "When is the preferred time to cut fingernails".