Don't worry if your brew takes up to 3 days to show signs fermenting.
Especially if you used liquid yeast and didn't make a big starter and oxygenate.
It is also worth noting that no bubbles in the air lock does not mean it isn't fermenting.
If at 3 days nothing seems to of happened then take a gravity reading to make sure you haven't missed the fermentation.
It is preferable to have a brew start fermenting as soon as possible
If you follow correct and advised procedures then I say most brews see activity in 6 to 18 hours. If this doesn't happen then it doesn't mean you've done anything wrong. You may just not be seeing it or it's taking it's time.
It is quite common for new brewers to get worried after 24 hours to 48 hours.
They get told to wait and then realise that the advice was correct.
First brew, and worried - Home Brew Forums
Especially if you used liquid yeast and didn't make a big starter and oxygenate.
It is also worth noting that no bubbles in the air lock does not mean it isn't fermenting.
If at 3 days nothing seems to of happened then take a gravity reading to make sure you haven't missed the fermentation.
It is preferable to have a brew start fermenting as soon as possible
If you follow correct and advised procedures then I say most brews see activity in 6 to 18 hours. If this doesn't happen then it doesn't mean you've done anything wrong. You may just not be seeing it or it's taking it's time.
It is quite common for new brewers to get worried after 24 hours to 48 hours.
They get told to wait and then realise that the advice was correct.
First brew, and worried - Home Brew Forums