If you start with way more then you need, and you know how much you will lose during the boil, then just boil longer in the beginning. So if you start with 9 gallons and expect to lose 2 gallons during a 90 minute boil, and you are looking for 5 gallons, just boil until you only have 7 gallons before you add any hops. So essentially, boil until you have the proper starting volume before you 'start' the timed boil and your hop additions.
So you take a gravity reading of your boiling wort till it's at the og?
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