I used to work with someone who had a message telling people she only checked her email twice a day. You pretty much needed to call her if you needed anything outside of those times. (She worked in a remote office.) I think she had read one of those books on efficiency that recommended scheduled email time. But there were problems with this: 4. My department often had to email attachments or text to illustrate our questions/concerns. And we were on deadlines. Reading a page of text over the phone was not an efficient use of anyone’s time 5. She did outreach & was often out of the office on site visits, trainings, or travel to these places, but never ever set her OOO for these, because she was “working.” However, she was effectively not available to read emails from other staff until after hours on those days.
Whenever you need to step away from the office and won't be able to respond to emails as quickly as you usually do, it is good practice to create an out-of-office email autoresponder to guide your email correspondents on how to reach you, who else to contact, and/or what to do next.

I say this as someone who used to have a chronic problem keeping up with my personal voicemails. But I got voicemail transcription set up so I can read them now, because just ignoring important phone calls has consequences. I can’t imagine trying to just duck them in a professional job where I had a phone number, and therefore an expectation that people can call me!
Naturally, she had to take the day off — and couldn’t let folks know with any old generic auto-response. Instead, she made a guessing game of it in her out-of-office email, which you can use for yourself, below.