Attention economy
It's not just work-related calls on your time, though. Most people's work days now include social media, contact with friends and family, other interruptions which slow the pace and flow of the job in front of you. Our devices also pursue us after hours, with crackified content and the constant siren song of social media, games, etc. I've found the best way to secure my sanity was to strip down all digital interactions, closing my Facebook and Instagram accounts and deleting all but a handful of Apps from my phone, implementing a policy of blocking all non-essential emails at work (including from colleagues I designate as "time wasters"), using a disposable email account to open accounts and services, etc. It's freed up an amazing amount of time that, in the days before the smart phone, would probably have been spent taking cigarette breaks and dropping into the pub for a quick one between meetings.