Delaying start of a slide deck gallery

Hi everyone, I am sorry in advance if this is basic, I am rather new to this. On my site I have two slide deck galleries, one right after the other. I want them to play at the same interval, 3 seconds, but I would like one of them to have a delayed start of 1.5 seconds. That way they can alternate. Is there a way to delay the start of one? Thank you.

Maybe something like this:

let delayInSeconds = 1.5;
$w.onReady(function () {
    $w("#gallery1").pause();//use your gallery property id
    setTimeout(() => {
        $w("#gallery1").play();//use your gallery property id
    }, 1000 * delayInSeconds )
});