Infusing something for longer will not hurt it; it will only add more flavor.
One month was the time frame I gave based on how long it took to make
chocolate liqueur (vodka, simple syrup, cocoa powder and a vanilla bean).
However, I didn't keep the bottles in the sun; I kept them in a dark cabinet.
By the way, the olive oil I mentioned earlier was not "cut and paste", it is
something I've actually made based on the kind of herbs and spices I like. If
I post something that is not my own words, I'll link to it.