I did it last night to kill time as the AS lounge at LAX is pretty pitiful. It takes at least 20 minutes to walk. There are a few ups and downs. You go downstairs and through the tunnel to terminal 5 and then through to terminal 4. Then go up through the AA gates and it directs you to TBIT. There are quite a few restaurant options over there and depending on the time of day, the other terminals can be a bit less crazy than Terminal 6.