7 or 8 is ok also ler
what i'm considering is the traffic condition earlier in the night is:-
1. traffic have not subside
2. specially jammed every friday night
3. plenty of people going back hometown right after friday working, so the jam is there
4. people coming from outstation is going home...
Based on the above, that's why i propose 10 lor...however, if we planned to go earlier also can lah.. :)