Heck If you made 190ml of it to steep in the barrel (I seem to remember reading that). You can take out a few ml each week to sample and let it go at least 4-8 weeks to see what length of steep might be the best. While at the same time being able to enjoy it along the way.
Cheers,
Steve
Edit I was thinking along the lines that if you think each week tastes better than the last, to keep letting it go another week until you find it either getting worse or no longer changing. That way from now on you will know exactly how long to age it in the barrel. Just a thought.