The No. 1 answer was less than 15 minutes, with 32 percent, and No. 2 was "I don't check Facebook during the work day" at 27 percent. That doesn't differentiate between those who don't use Facebook at a work and those whose employers forbid it. The final three categories – “Up to one hour,” “What's Facebook?” and “I keep Facebook open all day”, each drew 14 percent. There must be some rounding since the percentages total at 101. But putting together all the answers that reflect some Facebook usage shows that 60 percent check in at least once daily. I'd put myself in between up to one hour and all day. Sometimes I have two sessions open because I forget I had one already. And sometimes I close out to simply what's open. But I’m closer to leaving it open all day.