This is how I see it panning out now..
20/12 - Ash vs Kotetsu begins.
27/12 - Break.
3/1 - Ash vs Kotetsu ends. Ash vs Virgil begins.
10/1 - Ash vs Virgil ends. Closing ceremony.
17/1 - TR returns and N enters, but the group is doing fillerish stuff, so it's unknown by them.
24/1 - Episode N is in full swing.
Of course Ash vs Kotetsu might even be just one episode, with Pikachu vs Lucario as the last match up, spilling over into 3/1 but ending within a couple of minutes. Then Virgil's battle won't even need to take up any of 10/1, giving us an extra episode to play with.