Ben, I too have almost the identical question about when to discontinue
feeding.  The only apparent differences between your situation and mine is
that I put on the second hive body three weeks ago, and our weather has
been wetter -- seldom more than three sunny days between extensive rainy
periods.
 
All four of my "beginner" books, the instructor in my introductory
beekeeping class, and my supplier agree I should stop feeding "when the
bees stop taking the 1:1 sugar water."  When will that happen?  My two
hives of Carniolans have been consuming 1+ gallons a week since installing
the packages 7 weeks ago.  Yesterday, both division board feeders were bone
dry again in just six days.  The positive side of this is that feeding
seems to be encouraging comb building on my new Duragilt frames.
 
Can one of you experienced people help?
Rog Flanders, Nebraska
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Ben Pollard wrote on 6/10/98:
>They still seem to be feeding on alot of sugar water. In
> fact they are taking more now then I have seen in the past 6 weeks. I
see> lots of nectar sources around and lots of activity with many bees
coming in> with their pollen sacs full. Is this normal and should I keep
feeding...or should I quit feeding now?