teleplays are not quite the same as screenplays, so the 1 page=1 minute rule of thumb doesn't apply...
you need to check some tv scripts and a good how-to for the format... for one thing, a 2-hour tv movie will not have only 3 acts, like a regular film, due to commercial breaks...
go here for a good rundown on the format:
http://www.screenstyle.com/screenvssits.html
scroll down to:
Screenplay vs. Teleplay: A Comparison
hope that helps... hugs, maia