Boil Lengths

[haysie]

so i boil for 60. if i wanted to boil for 90 wouldnt i loose more to evaparation?

my kettle starts off at 43 full to the brim and i end up with 33 into the fermenter after a 60 boil (keggle with a massive opening). i would boil off more for a 90 yes?

lucky im getting my 100lt pot soon.

yes, yes and yes, for all the reasons above,