For 8 hours (the estimated length of the atack)?
No, not the full 8 hours. We know that the attack on the compound started at about 3:40PM EST. Obama’s official schedule...
http://www.whitehouse.gov/schedule/president/2012-09-11
details his whereabouts until 5:00PM EST when he was briefed by Leon Panetta.
We also know he talked on the phone from 6:30 to 7:30 EST with Bibi Netenyahu.
After that call he was immediately briefed in the Oval Office by Denis McDonough, Deputy National Security Advisor, National Security Advisor Tom Donilon and Chief of Staff Jack Lew.
It is after that briefing, sometime after 7:30 EST that Obama’s whereabouts become unknown until his 10PM phone call to Hillary Clinton.
http://www.nationalreview.com/article/348677/10-pm-phone-call-andrew-c-mccarthy
The new “debate prep” info at least suggests where he might have been between 7:30 and 10.