I wish you well. As with any ID only speakers that you can't audition personally, one just hopes your preferences fall in line with those that gave it positive reviews. Personally, I haven't heard them but I do know many people rave about Brussells sprouts but I can't stand the dang things.
As for break-in and how long, just play 'em normally until about a week before the trial/return period ends. If they sound good, they're broken in. If not, box 'em up and return them.
Oh, save all packing materials, receipts,and boxes until then at least.