3DS users will have some complications tomorrow, as Nintendo is planning some 3DS maintenance. It will run for 2 hours. In the US, it will run from 4:30pm to 6:30pm on the West Coast and 7:50pm to 9:30pm on the East Coast. As for Europe, it will technically be January 18th when the maintenance begins. In the UK, the maintenance will occur from 12:50am to 2:30am. The rest of Europe will experience the maintenance from 1:50am to 3:30am. Certain network services may be impacted by this, so you may want to keep that in mind.