Timeline not showing more than 15 mins of video

[bernie]

I have a long video (over 30 mins) and when I put it in the timeline, it only
displays 15 mins of time in the preview pane. I can manually scroll in the
preview pane and see the rest of my movie, but when I go to edit it is very
difficult cos the timeline only shows 15mins. Can anyone offer some
assistance?

 

[bernie]

I have added it as an mpg file (having come straight from vob). But since
then i have tried adding it as an avi and wmv and it is working ok, so I'll
see how I go from here...

For interest sake where can i find the slow down half effect & what does it
do?