I've never ever tried to make sekanjabin but here's my guess:
total volume after mixing together will probably be
about 6-6.5 cups and the evaporation will be fairly low if you heat it gently just to dissolve the sugar, say below 2%.  When brewing beer I get 8-10% evaporation during the one hour boil.
I guess simmering too long will cause the sugar to precipitate when the syrup cools down to room temp but then again, I've never made a single batch of sekanjabin in my entire life.  I'll try and find some fresh mint and mix up a batch this weekend.
/Angus, going back to lurking under the Rock(TM)

--- BaronessaIlaria@aol.com
> wrote:
>Hi all
>
>Using the following recipe, which has been posted in the Florilegium and is
>the one from the Miscelleny, approximately how much final product would
>result if the dilution is 5 to 1? Since some of the liquid evaporates while
>making the syrup I am trying to estimate how many batches of syrup I will
>need for an upcoming event. Rough guesses would be helpful.
>
>4 cups sugar
>2 1/2 cups water
>1 cup vinegar
>handfull of fresh mint
>
>Many thanks,
>
>Ilaria
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==
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