Is there a known shelf life for Methoxide?
It is stored in an airtight carboy.
Searching this forum, there is only one place from 2005 where Girl Mark answers that there is no Shelf life for Methoxide.
Does anyone know otherwise?
Is anyone making Stock Methoxide and uses it?

I always use mine within 15 minutes of mixing.

Don't let it sit around if you don't have to. I haven't heard any stories of anyone trying day old, or week old methoxide, but if you do, let us know.

I use a converted stainless steel beer keg and have had methoxide in there for over a week with no problems

The key is to keep it sealed to keep water vapor from getting in there.

Thanks all.
I plan to make stock Methoxide.
I'll make 100gr NaOH per Liter of Metahnol.
Keep you guys posted

Sounds kinda heavy on the NaOH. What does your oil typically titrate?

Maybe I didn't explain well enough.
100gr NaOH per liter Methanol is just concentrated stock.
WhenI have to use it, I titrate the usual way (BTW , my oil usually titrates at 1.7 * 1.15 + 5 gr base, which adds to 7gr NaOH per liter) so for a batch of 150 liter, I will need 1050 gr, so I will take 10.5 liter from the stock and add the rest from the methanol.