How soon after arriving to AIT do I get off post pass for Fort Jackson 42A AIT?

PFC (Join to see) , right now, you need to concentrate on the steak and not the peas.

That cannot be answered here on RP. You need to seek out your CoC and ask that. I am guessing you just arrived there so not likely in the phase you are in now.

There are so many variables to the possible answer it would be an injustice to give you a timeline.

Policy, opinions, personal bias, from
TRADOC
Post commander
Brigade Commander
Battalion commander
Company Commander
DOD or post threat assessment
And more...all come into it.


Bottom line the only accurate answer will come from your Drill sergeant