Product teams often lengthen a free trial hoping that more time will create more loyalty. Sometimes it does. Often it simply stretches the same thin engagement across more calendar days and pushes the first invoice further away.
Look at the day when most successful converters first experience the core value of the application. If that day sits well inside a fourteen-day trial, extending to thirty rarely improves paid conversion. It can even weaken it by training people to postpone the decision.
Shortening makes sense when the majority of eventual payers have already decided by day seven or ten, and the remaining days show little additional activation. In those cases a tighter window, paired with clearer reminders of what the trial has unlocked, tends to produce cleaner decisions.
Before you cut days, check whether late converters are high-value accounts that need internal approvals. Enterprise buyers may need the longer window even when individual users decide early. Segment those paths before you change a single setting.
Any change to trial length should be treated as an experiment with a defined review date. Compare the same cohort stages before and after, not only the headline conversion rate.