Cooldown teleport players

Hello i Want to add a cooldown for teleport all players in a world but i don't know how to make this simply.

 

switch($args[0]) {
case "start":
foreach($this->getServer()->getOnlinePlayers() as $players) {
$players->sendMessage(TF::LIGHT_PURPLE . "This game has been started.");
$x = mt_rand(-250, 250);
$y = mt_rand(70, 100);
$z = mt_rand(-250, 250);
$players->teleport(new Vector3($x, $y, $z));
$players->setGamemode(0);
}
return true;
break;

 

You can use microtime(true) to get the current timestamp.
You could also use PocketMine's Task to count down, but that isn't as accurate.

 

can you give me a example please ?

 

Use php's microtime(true) function to get the current timestamp.
Use your preferred way to save that together with a player's name or uuid.
Compare times whenever the command gets run.