public class onPlayerDeathEvent implements Listener{

    HashMap<Player, Long> shardsCooldown = new HashMap<Player, Long>();

    public void onPlayerDeath(PlayerDeathEvent e) {
        Player p = e.getEntity().getKiller();


        int cooldownShard = 3000; //5 minut w sekundach

        if(shardsCooldown.containsKey(p)) {
            long secondsLeft = ((shardsCooldown.get(p)/1000) + cooldownShard)  - (System.currentTimeMillis()/1000);
            if(secondsLeft>0) {
                p.sendMessage("Tutaj nie wypada shard");
            }else {
                p.sendMessage("Tutaj wypada");
                shardsCooldown.put(p, System.currentTimeMillis());
            }
        }else {
            p.sendMessage("Tutaj wypada");
            shardsCooldown.put(p, System.currentTimeMillis());
        }

    }

}