Historically, both employers and employees have incongruent and hazy understanding and a polite agreement as to how this kind of time gets accounted for (how much it is and who is accountable/responsible for it), especially in salaried positions/knowledge workers. That's probably going to change. If anything, the work-from-wherever trend will help people get a better understanding of and draw the line between work-time and personal-time, productive time and non-productive time, total compensation, and what, exactly, they are being compensated for, and how this time is grokked and tracked.