Final answer:
When discussing free trial periods, it is better to provide an approximate duration like 'about 30 days' rather than exact dates to allow for flexibility and to set general expectations.
Step-by-step explanation:
Rather than providing exact dates, which can vary and may not be remembered accurately, it is smarter to say "Free trials are about a certain duration" such as "about 30 days" or "about one month." This approach allows for some flexibility and acknowledges that the exact length of a free trial can be subject to change or might include variations depending on the company offering it. It also helps set a general expectation without committing to a specific number of days that could be counted as a contractual promise.