But how many of us even spend one or two hours a week focusing on our portfolios?
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DVDs could record up to six hours of television programmes against the miserly one or two hours offered by the current designs.
For example, you might consider a limit of one or two hours a day and, for a better night's sleep, no screen time in the hour before bed.
Having said that, we do know sleep is key: Teens need an average of one or two hours more sleep than their 9- and 10-year-old siblings, yet studies show most teens gets a few hours less.
As July wore on, the daily procession of ambulances dwindled to one or two every few hours, then ceased altogether a sign that the Okinawa battle was now history.
One client spent two or three hours on cross-continent video conference calls trying to decide if they would try one 90 minute session .
Users often chew one or two bundles for up to six hours at a time.
While the amount of alcohol needed to really wreck a person varies by size, gender and genetics, most studies quantify "binge drinking" as consuming more than five drinks in a night--or more than three drinks in one to two hours.
So they end up having to get up one, two, or, in extreme cases, three hours earlier than their internal clock would dictate.
"There were only two instances when a private hire company was used to drive Mr Rhodes to an evening meeting or speaking engagement and these both resulted in a travel time of between one and half hours and two hours late at night, " a spokeswoman said.
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