The phrase "certain timeframe" refers to a specific period of time or deadline that has been defined or agreed upon. It means that something needs to be done or achieved within that particular time limit. Full definition
Refunds are available from our writing service under certain conditions and within certain timeframes as follows: (advanced-writer.com)
Many personal auto insurance providers may exclude coverage during certain timeframes when you are using your vehicle as a rideshare driver. (farmers.com)
The law also created standards for «electioneering communications», which are communications made within certain timeframes close to an election that referred to a candidate for federal office and were transmitted in way that they could be received by 50,000 or more persons. (nar.realtor)