I've test bottled one 500ml bottle of Ginger Beer with one Coopers priming drop. How long does priming take? If I opened it in a day would it have some pressure/fizz/gas or does it need a week or so? I want to ascertain if one drop was enough as I don't trust the terrible instructions' rough 'heaped teaspoon' amount; seems far too inexact to me!
Bottle priming takes typically 2 weeks, depending upon temperature and yeast health. The bottles should initially be stored at room temperature so the yeast can produce CO2 from the priming sugar, which takes 2-3 days. If you opened the bottle then, you'd get a loud hiss and flat beer, since all the CO2 is in the headspace. After the CO2 is produced, it needs time to dissolve into the beer. This takes about 10 days, so 14 days total is typical.