Going to Momofuku Ssam tonight, quick question regarding wait
They have a bar next door called Booker & Dax, but it is seated only, no standing. They will take your name and you can wait at Booker & Dax if they have room, or you can wait outside. There is a counter inside but it is treated like regular seating.
Earlier is better. If you go around 7pm, shouldn't be longer than 30 minutes at most; gets hairier around 8, 8:30pm. Turnover is fairly quick for a party of 2, unless you refuse to sit at the communal counter. The long communal counter means that parties of 2 will get sat pretty quickly (usually facing each other).
However, on a Saturday a few months ago, my party of 3 had a one hour wait, and we got there around prime time. We ended up at one of the longer communal tables (an 8 top I think).