First of all, I tweaked everything in 5 minutes max. And while rendering I had Windows Media Player on and I was surfing aswell.
Secondly, I believe that you can tweak the settings even better.
This is what I remember doing.
Changing the lights caustic photons to 70000.
Samples per pixel: Min 1/4, Max 4
Bucket Width: 48
Max. Trace Depth: Refl 3, Refr 4, Sum 4
Indirect Illumination tab
Photons (Caustics & GI)
Max. Trace Depth: Refl 3, Refr 2, Sum 5
This is what I remember going through and changing. I believe the biggest time savers are the Samples per pixel and the Max Trace Depth Settings. Hope that helps.
And thanks for posting your file. I hope you can see this as a reward.