Question about output of last command

When looking at the output of the last command, I believe that the last column is the length of time the session was logged in, but what does it mean when there is a number added to the beginning? Is that days? Thanks.
e.g.
user pts/0 workstation.fqdn.com Thu Nov 16 12:20 - 20:30 (5+08:10)
user pts/3 workstation.fqdn.com Wed Nov 15 11:37 - 18:17 (06:40)