JSFiddle - React, Tailwind, and code Playground

HTML

<span>1d</span>
<span>2d</span>
<span>will expire in Unlimited</span>
<br />
<span>1d 2d will expire in Unlimited</span>

JavaScript

$(document).ready(function() { 
     function recursiveReplace(node) {
    if (node.nodeType == 3) { // text node
        node.nodeValue = node.nodeValue.replace("1d", "1 day");
        node.nodeValue = node.nodeValue.replace("2d", "2 days");
        node.nodeValue = node.nodeValue.replace("will expire in Unlimited", "will not expire");

        return;
    }

    if (node.nodeType == 1) { // element
        $(node).contents().each(function () {
            recursiveReplace(this);
        });
    }
}

recursiveReplace(document.body);
     });