A 30 - minute session of play produces three hours of power, with a full charge of 72 hours possible from six to eight hours of activity. (discovermagazine.com)
I learnt so much through a brief 30 minute session in which no question was actually answered. (totalpolitics.com)
In the morning, new businesses to the industry will illustrate in 15 minute sessions on what they have that is totally new to the business. (idate2012.com)