If you need immediate assistance during my absence, please contact [contact’s name] at [contact’s email address]. Otherwise, I will respond to your emails as soon as possible when I return.
I might sound nitpicky but the language is important. “Might” or “may be” or “slower than usual” are vague and don’t offer the sender all that much information about when you’re really going to respond to them. Worse, they do a horrible job of protecting the time of the email receiver who, as the responder notes, is not in the office! Such a responder implies that, not only will the vacationer reply to the email, but they may not even miss a beat. They may be slow to respond, but they also might not.

Yes! I once went through a chain of 4 people’s OOO and was finally directed back to the first person. It was our benefits broker and you can bet that was the year we decided maybe we should entertain other options before renewing our contract.
Thanks for calling [Company Name].For more information about our products, press 1. If you have troubleshooting questions, press 2. For billing questions, press 3. For a Dial by Name directory, press 4. For our regular business hours, press 5. If you know your party’s extension, please dial it now. For all other inquiries, please stay on the line, and a representative will be happy to assist you. 5. Offering the Operator First