Depends on the drugs - were all the drugs tds (three times a day)? Or were some of the 0900 just once a day medications? Something like acetaminophen (paracetamol home in aust, lol) shouldnt be given more than 4 hourly, however there are slow release compounds of the same drug, that shouldnt be given more than 6-8 hourly, so it really depends on what medications, diagnosis, etc.
Im sure you would have done fine, and it was good that someone else helped you out a bit. I would have said something like 'sorry to be nosey, but how does it work now with the medication having been given at different times', but it depends on the nurse, some are willing to help you learn, some are genuinely too busy or unable/unwilling to explain.
Good luck with your first year