Our office will be closed on [date] for the public holiday and will reopen again as normal on [date]. Contact details for emergency can be found on our website.
For many roles, of course, the sort of OoO described wouldn’t work. But there are a lot of roles where people would survive just fine letting their requests sit for an extra week before forwarding again. And especially at smaller companies where there they might be pressed for coverage when people are out, I think it’s great to normalise that a job is basically ‘off-line’ for a week or two so that the employee can rest and recharge.

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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.