Emails have the option of scheduling responses. You can use that to your advantage and set some responses to be automatic but at the same time, you need to establish boundary and let your client understand that you need proper information to prepare ahead and that it cannot always happen that way.

These is really very common to me now. In a fast-paced environment, it's crucial to manage client expectations effectively. When a client expects instant responses, I focus on setting clear, respectful boundaries that don't compromise our relationship. For example, I acknowledge their urgency and provide a realistic timeline for when they can expect a response. I might say something like, ‘Thank you for reaching out—I’ll review this and get back to you by giving time and date.’ This shows that I value their time while ensuring I have the bandwidth to provide a thoughtful reply. I also encourage clients to prioritize their requests if they need faster support, so I can address the most critical items promptly.