Well that's the thing, you don't know how long it has been steeped before you get it, so even the same flavor from different batches could be ready, or they could need to steep a bit longer. The only advice I can give is smell it, if it is overpowering and perfumey give it a while longer to steep. If it doesn't, give it a try, does it taste and feel "ripe"? If not let it steep longer. If after a month, it still doesn't seem right, do another couple weeks to a month, but after that most likely it isn't going make a difference.
I get what you are trying to do but I could get a bottle of turkish and it is ready to go out of the mail, and you could get a bottle of turkish that still needs a month. It doesn't really make sense to give a predefined steeping period when every situation involves different variables, there is no constant to base anything off of. If halo didn't presteep their juices, and they came fresh off of being made, it would be a viable subject, but there is no way to tell and it would be worse to misinform people of what they should do.
Just my $0.02
On a side note, I love your avatar, maybe if I made mine Rusty or Early, me you and Whezzal could be one heck of a power hour, or well power 3/4 hour.