What is the ideal length of a subject line? December 29, 2018 By CertificationAnswers What is the ideal length of a subject line? 41–50 characters 55–75 characters 10–20 characters 75–100 characters Related content Related posts:Hubspot Email Marketing Certification Exam Answers 2018Hubspot Email Marketing CertificationYour coworker recently tested two different subject…True or false? This an example of timeliness within…