CEOs in the UK have been spending more than an hour and a half a week on Brexit planning, according to a recent study. CFOs have spent more than two hours. Together, UK executives in those two roles are devoting a combined 200 hours a year, on average, to Brexit preparation. For CEOs, that represents about a week and a half of Brexit planning in a year. But it’s still not clear what, exactly, they’re supposed to be planning for.