Adding a command cooldown, reading time left?

Hello,

I use this system cooldown and I have a few questions.
1. What happens with the time of cooldown if the server is crash/off. Is it reset then?
2. Is it possible to read how much time is left?

Code:

using System.Collections.Generic; //Using directive containing the HashSet classnamespace Oxide.Plugins //Namespace where plugins must go
{
    [Info("TestPlugin", "JoeSheep", "1.0.0")]
    [Description("A Test Plugin.")]
    class TestPlugin : RustPlugin
    {
        HashSet<ulong> Cooldowns = new HashSet<ulong>(); //Create our list to store the players currently in cooldown
        const string Perm = "TestPlugin.test"; //Create the permission        void OnServerInitialized()
        {
            permission.RegisterPermission(Perm, this); //Register the permission when the server initializes
        }        [ChatCommand("test")] //Create the chat command to do the following
        void cmdTestCommand(BasePlayer player, string cmd)
        {
            if (permission.UserHasPermission(player.UserIDString, Perm)) //Check if the player has the permission "Perm"
            {
                if (!Cooldowns.Contains(player.userID)) //Check if the player is listed in the HashSet "Cooldowns", if not continue
                {
                    Cooldowns.Add(player.userID); //Add the player to the Cooldowns HashSet so they cannot run the command again until removed
                    timer.Once(10, () => Cooldowns.Remove(player.userID)); //Create and start a timer for 10 seconds, when it expires remove the player from the Cooldowns HashSet
                    SendReply(player, "Test command."); //Send a chat message to the player saying "Test command."
                }
                else
                    SendReply(player, "Cooldown in effect."); //If the player is in the Cooldowns HashSet send this chat message to them
            }
            else
                SendReply(player, "You do not have permission to run this command"); //If the player doesn't have the permission Perm then send this chat message to them
        }
    }
}

^^
I rewrite this code to Hurtworld


Sorry for my English


Regards