If they absorb the yolk they should be able to survive 72 hours or more. That's why they can be shipped. Post office regulations require them to ship within 24 hours of hatch and have a reasonable expectation of being delivered within 48 hours of shipping. A postmaster explained that on here a while back. It doesn't hurt them to eat or drink earlier, it's just not normally necessary. Some will eat or drink earlier than others.
I'm using weasel words like should or normally. Not every chick is normal. Hatching is hard work and they often need to rest a bit to regain their strength before they are actively running around. Sometimes some are really weak after hatching. Drinking or eating something to give it some quick energy can help.
I use a medicine dropper but a pipette can work. Some people use electrolytes or something else special they buy, but some people just dissolve sugar in water. I use hummingbird liquid. I put a drop of liquid on the tip of its beak, they generally swallow that. Then keep putting drops on the beak tip until it stops drinking it. That's usually not a lot. The idea is to hydrate it but also give it enough energy so it feels like eating and drinking on its own. I've done the same thing with an injured mature hen.
I do not do this with every chick, just the ones I consider "not right". If one were still weak after a night I'd consider it a good candidate. Often if one is like that there is often something wrong with it to start with and it's not meant to make it. That doesn't mean you don't try because some will make it.