I asked when the duel would be, and Xesta says after he hits level 37, so i guess we gotta wait for that first. According to him he only needs 3 million XP, so shouldn't be too long i supose.
Also i asked how much each of us should pay each other, and he said he wouldn't want to ''waste'' more than 100k on me, so i guess thats what me and Xesta will pay each.