I just got back from NRT. We dilly-dallied around in the RCC for a good while using the free WiFi. We got hungry, so shuffled down to the SQ lounge (maybe we walk fast: took us 6 minutes). It was 6:25PM, and the last SQ flight of the day was in final boarding. We got up to the lounge (on the second floor of the satellite) and it was deserted. The lounge attendant was in the final stages of cleaning up the food and drinks. She looked at us in horror when we walked in, assuming the worst: that we had missed the last SQ flight somehow.

Needless to say, we didn't stay long.

Hours posted said it closed at 6:30PM, if I remember correctly.