With any of the SEAM releases or the Solaris 10 release installed, Kerberos is built into the login command, and you will obtain tickets automatically when you log in. The Kerberized commands rsh, rcp, rdist, telnet, and rlogin are usually set up to forward copies of your tickets to the other machines, so you don't have to explicitly ask for tickets to get access to those machines. Your configuration might not include this automatic forwarding, but it is the default behavior. See Overview of Kerberized Commands and Forwarding Kerberos Tickets for more information on forwarding tickets.
For information on ticket lifetimes, see Ticket Lifetimes.