72 inches long Click to see full answer. Also asked, how long should a shower curtain be? 72 inches long Additionally, how long is an extra long shower curtain? Extra Long (72″ x 96″) Shower Curtains. Correspondingly, are there different lengths of shower curtains? Fact #1: Liners come in different sizes The average shower curtain liner runs 70″ by 72″. Extra long liners typically run 70″ by 84″ or 72″ by 84″. Extra wide liners can run 144″ by 72″. There are also liners designed to fit shower stalls at 54″ by 78″.When should I replace shower curtain?The good news is that it’s easy to wash a cloth curtain, and you should do so at least every few weeks. However, that only takes you so far. After about a year, you need to replace your curtain—especially after it starts looking worn.