Weekend, go at 10.30am, SHARP.
Any later, and you'll need >1 hour to get your turn with the CSO.
That's a stuck pixel btw, remains in white, but I believe black would appear if you slide some characters or black lines across. Mine was also same spot as yours, but not so visible, took me 2 days to notice it after collecting from PopStation.
Went A Lab on sat... took me >20minutes to get a Q number, >1 hr to get my turn, and about another 15mins to get the replacement. Moment I told the Q counter about my problem, she was so apologetic despite not her fault.
Previously went on Weekday around 10.45am, was 2nd in Q, but somebody cut the Q and went 1st, I became 3rd.
Last went on weekday, 10.40am, kaos. Already snaking Q, I was 19 in Q.
Service wise ok for A.Lab, there were times they irritated me with stupid formalities (like need 2-3 days to call Apple to allow exchange of 1 stupid lightning cable) but after sounding out and asking for alternatives they manage to shrink it down to 30mins.
There were babes at the last visit there too, so not too bad, some eye candy while waiting.