It means how long it is, on WMP or any other player you should see it easily (e.g. 1h 40' 23").
This because (S)VCD = mpegs and mpeg size depends only on its type and duration. VCD = MPEG-1 (CBR) = 10 MB x minute (about 800 MB for a 80' movie. You can fit exactly 807 MB of cue/bin in a 80' CD-R, and 'authoring' a VCD [MPG
-> .bin + .cue] takes about 10 MB - a 80' CD-R has room for 2352*360,000 bytes = 846,720,000 bytes (807 MB) of 'RAW image'), which corresponds to a 1150 kbps bitrate; SVCD = MPEG-2 which is VBR, but it's better keep a bitrate so that size = minimum 800 MB for 55' length (looking at TMPGenc's wizard...), which corresponds to about a 1800 kbps bitrate (if the movie is shorter (or the movie is split on many CDs), you can keep a bitrate higher so that size = 830 MB. Use FitCD and look at the guide http://www.afterdawn.com/guides/archive/dvd2svcd_with_tmpgenc.cfm (FitCD part) , and , in general, to the whole guide (except the DVD / VOB --> MPG ripping/converting part, since converting an AVI is easier), for this.
Just a thing: make a check that the audio used in that AVI ia CBR and not VBR (read the FAQ http://forums.afterdawn.com/thread_view.cfm/196299 , expecially http://forums.afterdawn.com/thread_view.cfm/129217 )
i just downloaded GSpot which lets you know a lot about the movie when i did it said the movie was an AVI but i counldnt play the movie then it said i needed the divx 3 low-motion codec will this intifere in burning it to a VCD?