From the time I turned in all of my paperwork at immigration, to the time my process was finalized and ready for pick up was 6 business days... however, my wife turned her paperwork in on the same day and it took 4 weeks. So, I don't know that there is much of a "standard". Expect to wait a minimum of a month and you will probably be good.
From the U.S.
Lived in Peru since August, 2014.