My OOO is almost always “I’m out of the office and will be returning on x date.” My email sig has instructions along the lines of “for questions on x, email this list” for a couple of the more common areas people would contact me about that might need an urgent reply (as the lists go to more than just me, obviously), but most people have finally figured out to contact those lists to start with, anyway. If I were in the middle of a project or something that needed to be moved along in my absence, the project teams usually know when we’re out, but I’d put a back up in that case, if needed, but generally there’s not much to be gained by a longer OOO from me.
There’s just one problem with this approach: you’ve now obligated yourself to regularly check your email the whole time you’re out.

Hi Thanks for your email. I’ll be away from the office until [MM/DD] and will respond as soon as I can. For all support requests/needs, please reach out to [email] and one of my colleagues will be happy to assist you.
Your out-of-office message needs to set expectations around communication. First, provide information about when you’ll return. Misner suggests giving yourself an extra date to catch up.