[ReneG]

Use timers

pawn Код:

CMD:find(playerid, params[]) 
{ 
    new targetid; new Float:x, Float:y, Float:z; 
    if(sscanf(params,"u", targetid)) return SendClientMessage(playerid, -1, "Usage: /find (ID)"); 
    GetPlayerPos(targetid, x, y, z); 
    SetPlayerCheckpoint(playerid, x, y, z, 3.0); 

    SetTimerEx("findPlayer", 1000, 1, "ii", targetid, playerid);
    return 1; 
}  

forward findPlayer(playerid, forplayerid);
public findPlayer(playerid, forplayerid)
{
    new Float:x, Float:y, Float:z;
    GetPlayerPos(playerid, x, y, z);
    SetPlayerCheckpoint(forplayerid, x, y, z, 3.0);
    return 1;
}

That's a basic example, you'll still need to kill the timer accordingly.