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https://www.homebrewtalk.com/threads/no-visible-fermentation-activity-after-12-hours.383242/
As long as you didn't put it in a scalding hot water it will be fine. Might want to wait a little bit longer. Although I generally see the signs within the first 12 hours it's not unusual that it could take longer , like 24 or 36. Also, like kevinb says - check the fermentation temp.
https://beercreation.com/why-your-homemade-beer-isnt-fermenting-and-how-to-fix-it/
A non-fermenting beer is connected to your wort, its sugar content, and the viability of your yeast. Either it’s too old or doesn’t have enough sugary nutrients to feed on. Higher and lower ambient temperatures can be a cause as can a lack of oxygen. All are necessary for yeast to ferment beer.
https://www.dummies.com/food-drink/drinks/beer/homebrewing-problem-no-fermentation/
Fermentation problems occur frequently to homebrewers, and a common one is that the would-be beer just never started fermenting. Before you pour your homebrew down the sink, make sure the process actually hasn’t started — judging fermentation by the bubbles (or lack thereof) coming out of the airlock can sometimes be deceiving. Check for signs […]
https://homebrew.stackexchange.com/questions/14795/14-hours-after-pitching-little-to-no-activity-is-it-ruined
This is my first homebrew, so I'm totally in the dark as to what to expect. However, I was told by my LHS that I should see a lot of fermentation activity after around 4-12 hours. The brew itself is an Irish stout using Wyeast Irish Ale strain, I made sure to let the bag swell before pitching so I'm fairly sure that the yeast was viable.
http://forum.northernbrewer.com/t/fermentation-is-active-spitting-from-airlock-after-12-hours-common/20681
Oxidation is not to much of a concern unless you shake the beer to cause quite a bit of splashing. The force of splashing can force air into the beer. After fermentation is complete you will see the beer begin to clear from the top down. This will begin about two weeks after the fermentation had begun.
https://www.beeradvocate.com/community/threads/first-home-brew-no-activity-in-the-airlock.9796/
If 48 hours or more have passed and you see no activity at all you may want to consider buying some fresh yeast and pitching it again. The longer it sits without fermenting the greater the chance it will become spoiled (infected) by wild yeast/bacteria. #8 cracker, Apr 3, 2012. smchenry75 likes this.
https://www.homebrewtalk.com/threads/no-fermentation-after-48-hours.167008/
Mar 8, 2010. #5. Without a starter, it may take up to 72 hours for fermentation to start in an ale. If you've made a lager, it might take signifantly longer. As long as your sanitation was good, the beer should be fine waiting for fermentation to start. It sounds like you got poor efficiency in this batch.
https://learningtohomebrew.com/reasons-why-your-homebrew-is-not-fermenting-how-to-fix-it/
First, calm down. It’s pretty common for homebrewers, especially new ones, to freak out if they don’t see a lot of activity in their fermenter within 12 hours. While it’s definitely possible to have signs of a healthy, active fermentation within that time period, it …
https://beerandbrewing.com/6-tools-to-unstick-your-fermentation/
A stuck fermentation is one that falls far short of reaching the expected final gravity, and as with many things brewing, the term is relative. A 1.050 pale ale that hits 1.012 instead of 1.010 probably suffers more from poor instrumentation calibration and repeatability issues than it does from stuck yeast.
https://homebrew.stackexchange.com/questions/2096/what-to-do-with-a-stuck-fermentation-after-2-days-with-my-first-beer-kit
I've had a batch of beer that fermented VERY quickly. As in finished fermenting within 48 hours of pitch. Take a hydrometer reading. If it is near/at your final gravity, I'd say you are ready to bottle/keg. Once you are finished make sure the lid is secured properly and that the hole in the lid of the bucket is fully closed off.
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