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Just below boiling for 15 minutes isn't going to go far in reducing a litre of solution. Why not do a CWE, pour off half of the solution and evaporate it and then cook up the other half? You can dose the cooked solution right away and you'll be ready to go again once the CWE has evaped.
As far...
I ran across this elsewhere:
"How to easily make sodium hydroxide
Here's how: put two bowls side by side fill each one with a super-saturated salt solution(NaCl).Use rock salt(any pharmacy)cause table salt is iodized.Bridge the two bowls with a rag or towel that's wet with the same saturated...