To me 2 hr 20 minutes is pretty long movie, not "relatively short". 1 hr 20 minutes might be considered "relatively short". The way I understand it, the angles are part of the main movie, i.e. all the video images are in one VOB title, just that there is different program chain, that takes up very little space, for each angle. So basically, if you only want one angle, you get the data for the other two also included as dead weight, just not used. Each movie is different, but the angles stuff might add net size of maybe 10 minutes video time, on top of the 2:20. It is just a wild guess.
If you want to remove the other 2 angles, and save some compression, try to rip the movie with these 2 programs (or search for others):
1) DVD Decrypter. go to settings, and for File Mode you can select to retain one specific angle. I have no idea if this works.
2) Try program VobBlanker. If I recall it does not support angles at this time, Maybe it means that the other two angles will be excluded from the rip, I have no idea if this works.
As first check, look at file sizes in the ripped directory, see if the total sum of all VOBs of the main title is a little smaller.
After processing the ripped files with DVD Shrink you can test the final ISO on PC, not standalone, by mounting it with Daemon Tools, no need to burn before you are satisfied with the results.
Good luck. Please report results back.
