If you're referring to an RDP (Remote Desktop Protocol) connection that lasts for 30 days, it means you would like to establish a remote desktop connection with another computer and keep it active for a month. Here's a general outline of how you can achieve this:

1. Ensure that the target computer has the necessary RDP settings enabled and configured to allow remote connections. This typically involves adjusting firewall settings, enabling remote access, and creating user accounts with remote access privileges.

2. Obtain the IP address or hostname of the target computer. You will need this information to connect remotely.

3. On your local computer, open the Remote Desktop Connection client. This client is built into Windows operating systems.

4. Enter the IP address or hostname of the target computer in the appropriate field within the Remote Desktop Connection client.

5. Click "Connect" to establish the RDP session. You may be prompted to enter the username and password associated with the remote computer.

6. Once the connection is established, you will have control over the remote computer's desktop and can perform tasks as if you were physically present.

7. To keep the RDP session active for 30 days, ensure that both the target computer and your local computer remain powered on and connected to the internet during this period. Avoid closing the Remote Desktop Connection client or ending the session manually.

8. It's worth noting that RDP sessions may be subject to various timeout settings, security policies, or limitations imposed by your network or system administrators. Therefore, it's advisable to check with them to ensure your RDP session can be maintained for an extended duration.

Remember to follow any applicable policies and guidelines regarding remote access and security to protect the confidentiality and integrity of the systems involved.

Please note that this is a general guideline, and the specific steps may vary depending on your operating system and network configuration. It's always recommended to consult relevant documentation or seek assistance from your system administrator for specific instructions.