People ask this all the time, and the reality is that it's not predictable.
...Trader Sam's is very small.
Some people report showing up at open and walking right in.
Sometimes later in the evening it can be busy.
Turnover in the bar can be slow.
Maybe you show up after someone's bachelorette party takes over the bar and wait 3 hours.
Maybe they release a new mug the week before you go, and people start lining up at noon.
I suggest hoping for the best but understanding that maybe you'll show up and it'll be a 3 hour wait.