We chat a lot with our mate Bob (of Bitters fame) and we got talking about what a great falernum should taste like. Weeks passed (as we sampled numerous...
I just ordered one to try. "Any larger than [35cl] is too big for such a product" - well I guess the UK falernum market is probably quite niche, but for tiki bartenders/enthusiasts one can never have too much falernum!
Bob deals in small bottles but if he's happy to go huge, then sometime in the future a 35cl bottle would be great. Think any larger is too big for such a product.
Indefinity is a very long time! However, we made 18% to have enough alcohol to be shelf-stable after opening at room temperature. Oxygenation will degrade the flavour over time but it will not be affected by mould etc which can spoil those with less alcohol.