Aqui esta , Ajudei ? Like + Resolvido
private HashMap<Player, Long> playerLongMap = new HashMap<>();
//onCommand
Player p = (Player) sender;
Long delay = TimeUnit.SECONDS.toMillis(10);
if(playerLongMap.keySet().contains(p)){
if(playerLongMap.get(p) > System.currentTimeMillis()){
p.sendMessage("Em delay");
return true;
}
playerLongMap.put(p, System.currentTimeMillis() + delay);
}
playerLongMap.put(p, System.currentTimeMillis() + delay);