if(strcmp("/spraycrips", cmdtext, true) == 0)
{
    if (gTeam[playerid] == TEAM_GROVE) {
        new Float:x, Float:y, Float:z, Float:a;
        GetPlayerFacingAngle(playerid,a);
        GetPlayerPos(playerid, x, y, z);
        SetTimerEx("DestroyObject", 60000, false, "i", CreateObject(1524, x, y, z, 0.0, 0.0, a+90));
    }
    else {
        SendClientMessage(playerid,COLOR_RED, "[ERROR:] You are not in this gang!");
    }
    return 1;
}

// do like this 

// this on your command
if (strcmp("/your command", cmdtext, true, 10) == 0)
SetTimer("destroy", 8000, false); // 1000 miliseconds (1 second)

// this on bottom of your gamemode or filterscript
forward destroy();
public destroy()
{
    DestroyObject(your object id);
}