same user working on same task!need to calculate time on UserAction Checherd-Out &In,how to calculate?

[buzzy996]

data is like this,

DocId	UserAction	UpdateDate
00005376	Item Added	2/12/2014 9:23
00005376	Item Updated	2/12/2014 10:44
00005376	Item Checked-Out	2/12/2014 10:51
00005376	Item Checked-In	2/12/2014 11:03
00005376	Item Checked-Out	2/12/2014 11:03
00005376	Item Checked-In	2/12/2014 11:11
00005376	Item Checked-Out	2/12/2014 11:23

any help!