Telnet idle time settings on Solaris 8/Sun OS 5.8

Goodday all,
Please any knowledgeable guys out there who can help me solve this issue? I use telnet on a Solaris 8 system to administer networks in my company. My problem is the ubiquituous log out by telnet when the idle time comes, however busy I may be at the time. I want to change the idle time, if possible make it to never log me out again. I would appreciate any and all responses to this question.
Thanks.