JSFiddle - React, Tailwind, and code Playground

HTML

<div id="availableTimes">
    <input type='radio' name='availableTimes' value='Stuff1'><label id='1'>Label 1</label>
    <input type='radio' name='availableTimes' value='Stuff2'><label id='2'>Label 2</label>
    <input type='radio' name='availableTimes' value='Stuff3'><label id='3'>Label 3</label>
    <input type='radio' name='availableTimes' value='Stuff4'><label id='4'>Label 4</label>
    <input type='radio' name='availableTimes' value='Stuff5'><label id='5'>Label 5</label>
    <input type='radio' name='availableTimes' value='Stuff6'><label id='6'>Label 6</label>
    <input type='radio' name='availableTimes' value='Stuff7'><label id='7'>Label 7</label>
    <input type='radio' name='availableTimes' value='Stuff8'><label id='8'>Label 8</label>
    <input type='radio' name='availableTimes' value='Stuff9'><label id='9'>Label 9</label>
    <input type='radio' name='availableTimes' value='Stuff10'><label id='10'>Label 10</label>
    <input type='radio' name='availableTimes' value='Stuff11'><label id='11'>Label 11</label>
    <input type='radio' name='availableTimes' value='Stuff12'><label id='12'>Label 12</label>
    <input type='radio' name='availableTimes' value='Stuff13'><label id='13'>Label 13</label>
    <input type='radio' name='availableTimes' value='Stuff14'><label id='14'>Label 14</label>
    <input type='radio' name='availableTimes' value='Stuff15'><label id='15'>Label 15</label>
</div>

CSS

#availableTimes label {
}

#availableTimes label:nth-child(8n):after {
    content:"\a";
    white-space: pre;
}