new commandTimer[MAX_PLAYERS];

commandTimer[playerid] = gettime() + 20; // player can use command every 20 seconds

YCMD:command(playerid, params[], help) {
new timeLeft = gettime() - commandTimer[playerid], string[60];
	if(gettime() < commandTimer[playerid]) {
		format(string, sizeof(string), "You must wait %d seconds to use this command!", timeLeft);
		SendClientMessage(playerid, -1, string);
		return 1;
	}
        // rest of your code
	return 1;
}
}

CMD:ar(playerid, params[])
{
    if(GetPVarInt(playerid,"AirReconOnline"))return SendClientMessage(playerid,COLOR_RED,"ERROR: You have already set the Air Recon Online!");
    if(gTeam[playerid] != TEAM_Internationalforces && TEAM_America) return SendClientMessage(playerid,COLOR_RED,"ERROR: Your team dosent have Satellite!");
    if(gTeam[playerid] == TEAM_Internationalforces && TEAM_America)
    	{
        new playerState = GetPlayerState(playerid);
    	if(playerState != PLAYER_STATE_ONFOOT) return SendClientMessage(playerid,COLOR_RED,"ERROR: you must on foot to use this command!");
    	if(playerState == PLAYER_STATE_ONFOOT)
    		{
	        if(GetPlayerMoney(playerid) < 90000) return SendClientMessage(playerid,0xFF0000FF,"You dont have money to use Satellite!");
	        SendClientMessage(playerid,COLOR_BLUE,"i need air recon online!");
	        SendClientMessage(playerid,COLOR_BLUE,"copy that we are coming to your position in 2 sec!");
	        SendClientMessage(playerid,COLOR_RED,"You lost $90000 for air recon.");
	        TogglePlayerControllable(playerid, 0);
	        new Float:v, Float:c, Float:r;
	 		GetPlayerPos(playerid, v, c, r);
	 		SetPlayerCameraPos(playerid, v, c, r+30);
	 		SetPlayerCameraLookAt(playerid, v, c, r);
	        SetTimer("endar", 60000, false);
	        GivePlayerMoney(playerid, -90000);
	        SetPVarInt(playerid,"AirReconOnline",true);
	        return SendClientMessage(playerid,COLOR_BLUE,"We are in your position you can use Satellite!");
        	}
      	}
   	return 1;
}