24% won't hurt chicks the first week or two because that is when they need protein for growth. I'd cut back after that.
I sometimes feed 22% for the first 2 or 3 weeks.
For chickens, in my book, ideally I shoot for 20% till about 6-8 weeks. Then 18% till about 15 weeks when if possible I cut back to 15% till laying is about to commence. For boys, I stay at 15% unless they're molting.
All that said, it's hard to screw this up unless one starts feeding too much calcium when birds aren't building shells.
You can actually use 18% protein all the way through the growth period. But they can utilize more protein early and not as much when they are nearly grown.
Excessive protein is a waste and is discarded in the feces which becomes ammonia in the bedding. It is also hard on the liver. No need to feed more than necessary.
Mature roosters do quite well on about 13-14% protein. Trouble is, that type of feed isn't commercially available.
Purina makes a game bird maintenance feed that is 12.5%. Grains are around 8-12% so feeding a little more of that to adult males can cut the protein in the available feed.