How to reduce rotation speed of an object below 1?

Hey guys, so I’m trying to learn the basics and this youtube video had me use this code to create a spinning coin. I copied it and now the coin rotates but I feel like it is rotating much faster than on the video and more importantly, faster than I want. Can someone please explain how to make it slower than 1?

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CoinRotation: MonoBehaviour
{
public int rotateSpeed = 1;
void Update()
{
transform.Rotate(0, rotateSpeed, 0, Space.World);
}
}

Corrected script:

using UnityEngine;

public class CoinRotation : MonoBehaviour {

    public float rotateSpeed = 1; // The number of revolutions per second of the coin

    void Update()
    {
        transform.Rotate(0, rotateSpeed * Time.deltaTime * 360, 0, Space.World);
    }
}

Using Time.deltatime allows you to rotate the object regardless of the number of frames per second.
“360” means that with a rotateSpeed of 1, the coin will rotate at a speed of 1 revolution per second.