6 hours is fairly high for that resolution.. even on old computer
in quality tab use a recursion 1-4 or 2-4 max, remove the recursion of 10 in tailer, you dont need it (washes out detail), instead use a multiplier in photon tab its the key to getting more light in.
Your antialiasing setting is way too high, grid 4 will suffice in most case, catmull is best but also slowest so try one of the first options in that pulldown menu. Use thickness of 1 (and upsample of 1 because of the small detail).
Use 'limitdr -1' in tailer to help AA
For reflection quality start off with 100-300.
hope this helps, cheers
ric
btw, i never use whipped cream in my cappuchino
keep up the posting..