Better get your Octodad downloads in now.
The third major maintenance in two weeks is slated for this Sunday, and it's even longer than usual.
Nintendo of America has sent out a Twitter message indicating the eShop will be down all day Monday:
FYI: The Nintendo eShop will be offline for 24 hours of maintenance starting at 7 p.m. PT on 11/1.— Nintendo of America (@NintendoAmerica) October 30, 2015
It is not known if the maintenance will cause sales to be extended for the 24 hour period, as some are slated to begin Monday morning.