How long does the XP Ban last?

Yes, I admit, I was Commendation boosting to get the Venator armor set. My friend and I signed in guests on our consoles to fill up a Regicide lobby, and we spammed assassinations on the playerless guests to achieve the Master rank on the Assassin Commendation. I also understand that the server has no way of differentiating our motive against just wanting to earn XP. So therefore we have been temporarily banned from earning XP, but we can still access every part of the game otherwise.

My question is simply; How long does the ban last for?