Hum? Well apart from the fact that you haven't listed the quantities of the fruit/spices.......
I suspect any flavours from a relatively small quantity of fruit will be pretty much lost and it only giving you some additional body (if anything). The cinnamon will give some flavouring, as you can expect the alcohol, as it develops, to extract some of the flavour.
I'd say between 7 and 21 days.
Taste for the level of cinnamon as that's gonna be the one that's most noticeable (I suspect). Pretty much ignore any yeasty flavour as that will be removed by racking etc.
If you get what you consider an appropriate amount of the cinnamon flavour, then take the bag out.
p.s. and yes, you do, normally, need a lot of grape juice, grape flavour for it to have any real impact on a batch i.e. making a pyment with all grape juice and just using honey to bring up the gravity reading, rather than making a traditional, then adding some grapes (or raisins/sultanas) to actually add flavour instead of just body (and possibly nutrient for the yeast)......