Unlimited. You can add as many questions as you wish! But bear in mind, people are more likely to complete the survey if they know it’s not going to take too long. We tend to survey fatigue kick in after around 25 questions. Ensure that every question you are asking has an aim, will tell you something of value, and is not duplicated elsewhere in slightly different language.
Employee Surveys - FAQs - How Many Questions Can I Add To My Survey?
