Hi Diane! You can watch as many or as few hours as you like. No need to stay all day.
Some people just come for a few hours each time -- remember your pass also gets you back into the April, June, and September events, where we'll be offering all 60 credits each time.
Also, as Adam knows, in between the live events the lectures are accessible "On-demand" now called asynchronous by ARBO. The only caveat is when taken the courses in this mode a quiz is required to pass at 70% by ARBO while the "Live" events require no quiz. These will be open until December!!