[рони]

frost68,

$({numberValue: currentNumber}).animate({numberValue: 60}, {
    duration: 8000,
    easing: 'linear',
    step: function() {
        $('#dynamic-number').text(Math.ceil(this.numberValue));
    }
}).delay(3000).animate({numberValue: 57}, {
    duration: 8000,
    easing: 'linear',
    step: function() {
        $('#dynamic-number').text(Math.ceil(this.numberValue));
    }
});