Hello @speed57 I moved your MSG here as these questions are best in the forum for all to learn.
No need for external timer chips, but you will need code. By using virtual pins, BlynkTimer and other connection management techniques to keep your ESP running, even if not connected to Blynk’s server, you will be able to accomplish what you are looking for.
All of this is already covered in detail throughout this forum and in the documentation. However, there are multiple searches required here… look for these key words/phrases as well… Timed relay, Connection Management, Run sketch without internet, etc.