Kind of impossible for me. I'm still studying but my friends Dad who works for Barclays got me a job there so I'm picking up the floor trading and history research departments on the stock markets. Canary's Wharf, the big stock trading area in London. I have at least 30 tabs up at all times as I have to check for any slight indications of a change in the market and respond instantly, otherwise I could start turning a loss.
Oh well I prefer to get paid really well but for 100% concentration 14 hours per day rather and then then kick back when I get home (sometimes not till gone 10 in the evening though!)