$time1 = 22:33:11.5
$time2 = 22:32:13.3
$diff = $time2->diff($time1);
        if ($diff <= '0:1:0') {
        echo "Less than 60";
}

$time1 = 22:33:11.5
$time2 = 22:32:13.3
$diff = $time2->diff($time1);
        if ($diff <= '0:1:3') {
        echo "Less than 90";
}