Sorry for the sarcasm, but anyone concerned about bandwidth has probably clicked on the "lo-fi version" of the forum long ago. We're here to see images.
That's a great looking image!
I think 5 hours ain't bad. Trying to reduce that down to 5 seconds is insane but here's my insane attempt clocking in at 4.97 seconds:Click to view attachment
I didn't like the way the specular highlight anti-aliased so rendering double size for reducing the result back down in Photoshop gave a render time of 20 seconds.Click to view attachment
Both of those use a Z-buffered Kleig for the shadow which means it doesn't pick up the slight color of the glass. For that you need a ray traced light which bumps up the render time to 96 secondsClick to view attachment
That's my quick attempt to address the fundamentals of your problem. It uses no refraction since that's not a major issue with the appearance of flat panes of glass. Here's the PRJ. Just as I described above I used a blue material for the faces and a green material for the edges. I used the Glossy Specular plugin shader for the highlight but it's so small it probably didn't' matter.Click to view attachment
None of these approach the beauty of your image, but they DO retain the characteristics you mentioned and for most shots that would be enough. Given time I could probably think of low-impact solutions to get closer to your result.
But if your show is about detailed edges of glass you may have to get happy with detailed render times.
Edit: I see you wanted 5 minutes, not 5 seconds. Time to burn!