First five minutes of the brief. It may be that it’s a small company and everyone knows everyone and this is less important but if you don’t (freelance, big company etc) it’s a useful tool to set tone, relax people, establish backgrounds/experience levels etc. From the uk Standards doc 24:
“It is considered best practice to meet with the crew before commencing the formal briefing. This can have benefits in setting candidates at ease and setting a general tone of conduct, but also the examiner can glean much information from candidates over general attitude and behaviours, any potential impediments to the test ahead and general experience levels.”
It doesn’t even have to be in the briefing room - I find the taxi journey to the sim a convenient setting. If you do it right the crew don’t even feel it as part of the formal check.
HtH