I was an anomaly in that the first day I got it without taking notes, but most it'll take 3 days as some said above.
Here is the thing, never feel forced to do it. If you feel uncomfortable doing it and it's not clicking tell your GSTL, GE, HR, or ETL-AP. Point blank when it involved their money they'll do whatever it takes to protect it. If you tell them it's not working out for you they will remedy it quick.
We had someone who wasn't comfortable with it and it wasn't clicking. The person never said anything and a ton of mistakes happened. Needless to say people were pissed. That person never stepped foot in the cash office again.
Voice your concerns.