Temporal processing is a real render hog. Your times don't surprise me. I've had projects take five minutes of frame. It just depends on what you are doing.
As Rick said, perfectly normal. Doesn't sound like anything extraordinary at all... I've had 30 second clips ladden with effects render 20 hours and more. Just get used to it...
To get you right, you just want to deinterlace it in AE and it takes 30 hours?
That is definately NOT normal. Rick and Mylenium must have understood you wrong. or I did.
Try the De-Interlacer from Revision Plugins. It's in the Field-Kit plugin-pack. It renders fast for me.
The clip is an hour and a half... the render took 5 with temporal smoothing. Sounds normal to me.
Here's another problerm with the render:
I have been trying to export it into MPEG2-DVD format.
You should never try to render to an MPEG stream from AE's render cue unless it's for a quick preview. No Multi Pass rendering, No Intra Frame compression, None of anything you choose MPEG for except the container. IMHO it sholdn't even be an option in the render cue.
Use AME for delivery encoding or a 3rd party compressor. Render to Production codecs from the RQ....